Ls6 454 Head Specs



The LS5 454 @ 360 HP was the most powerful engine for the Corvette and the upscale 454 for the Chevelle. 614 Save $10 off $299, $20 off $699, $30 off $899, $100 off $1,899 Orders. Current Rebates & Specials. Custom stainless intake & exhaust valves. Open: 118cc: bowtie aluminium mkIV gen. The redesigned 1970 Chevelle SS was the perfect platform for the LS6 engine, which was underrated at 450 hp and 500 ft-lb of torque. Owner sent me one block casting # 3999289 GM 14 P. As with many high performance engines during the muscle car wars, there were lots of rumors flying around in regards to actually how much horsepower the 454 engines put out as opposed to what Chevrolet was reporting. Forged Racetech Pistons 9. For the pure enjoyment of R/C car driving, the combination of a beautifully reproduced car body with the FAZER series ch. It requires a head gasket bore of 4. like the vortec. The 454 motor is built to 450 hp LS-6 specs. 9 mm) bore and longer 4. LS6 Specifications The high-performance LS6 454 equipped with a four-barrel carb had an 11. 251 in (108. Under the hood sits a 454ci V8, "512" GM Block used for 454ci LS6 450hp V8. All flow numbers for CHW — Cylinder Head Works heads come from them Web Site updated April '10. 165 inch (55 mm) intake valves and 1. Blocks: Blocks: Heads: Engine: Part # Bore Size: 12559855 LS1: 12564824 LS6/LS2: 12562319 LQ9: 88958665 CNC LS6: 88958622 CNC LS6: 12562713 L76/L92. Stocked With More Power Our stock replacement cylinder heads live up to EQ’s reputation for quality parts and incredible service. 1970 Chevrolet Chevelle SS LS6 Convertible 454/450 HP – It turned heads and intimidated the competition on the boulevard in 1970 and it still does today, because forty years later there is still nothing like the LS6-powered Chevelle SS454, and this completely restored 4-speed convertible is as desirable as they come. The all new Fazer Mk2 touring car FZ02L chassis has been designed for the pure enjoyment of driving. 466 in (113. 1970 ChevelleSS 454ci 450hp LS6 Yes. For the pure enjoyment of R/C car driving, the combination of a beautifully reproduced car body with the FAZER series chassis can’t be beaten. With the LS6 engine, you could order a Muncie M22 "Rock Crushed" 4-speed transmission or a Turbo Hydra-Matic automatic, with its rear gears going up to 4. 25:1 compression ratio due to its forged steel crankshaft and forged aluminum connecting rods. 21" * Stroke ~ 4. Cylinder heads (P/N 12564825): Aluminum, symmetrical port: Valve size (in): 2. A cold-start video is available here. Torque Specifications for GM 7. Head Gasket. '69 issue of MT, A. 0 mm) 4 1 ⁄ 8 in (104. Joshua Mortensen. Two legendary codes L88 & LS6. 454 Big Block Performance Specs The original LS5 engine was introduced with 390 hp and 500 lb-ft of torque, while the LS6 was rated at 450 hp. LSX454 Crate Engine: 19355573 | Performance lsx454. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. 454 BBC Chevrolet Engine 4 Bolt Main MK IV LS6 Specs Rebuilt. The 241 heads were used on 5. 454 BBC Chevrolet Engine 4 Bolt Main MK IV LS6 Specs Rebuilt. We have a 1969 Chevrolet Camaro ZL1 powered by all aluminum 427 V8 paired with Turbo 400 automatic going heads up against a 1971 Chevrolet Corvette fitted with 454 LS6 with aluminum heads mated to Muncie 4-speed tranny. Cylinder Head Specifications. I have had my hand in all 3 (merc 370's and the 2 different LS6's), but way back in early to mid 90's so my memory will be close but not 100%. FAST is the leading developer of electronic fuel injection systems, EFI components, intake manifolds, tuning tools for high performance and street applications. Having trouble finding the correct spark plug. 1956 Chevrolet 210 Delray Club Coupe Pro Street that started it's life as a rust-free Oklahoma car. Horsepower @ rpm: 450 @ 5600. 165 inch (55 mm) intake valves and 1. 6 1996-04, Chevy TPI 1985-92 , Chevy LT1 1992-97, and Chevy LS1/LS6 1998-04. Looking forward to seeing these in action. and the original 12 bolt rear end with 3. Description. So feast your eyes on a 1970 Chevrolet El Camino SS LS6 just posted by Red Hills Rods & Choppers in St George, Utah. The receipt for the work is provided with the sale and cylinder head specifications are as follows:. The entire engine code contains the assembly plant, month and day. I know GM has a 454 with 425hp which comes with alum intake and then they had a 454 450hp alum intake and alum heads. (6) In 1971 454 applications, the LS6 with 4-bolt mains was only available in the Corvette. The star of the new Z06 was the LS6 engine which was named in honor of the 454 cu in. 3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug 3964292 1970 454 Closed 109cc 450 LS-6, 3994025 1971 454 Open 118cc 425 LS-6, 3994026 1971 454 Open 118cc LS6 6258723 1971 454 Open. The initial 2001 LS6 produced 385 bhp (287 kW) and 385 lb⋅ft (522 N⋅m), but the engine was modified for 2002 through 2004 to produce 405 bhp. Two legendary codes L88 & LS6. an intake change and a little more cam and I was over 500hp. 34416T1 Exploded View & Parts List The Fazer chassis has gone through a full transformation. Since this head has the same intake/exhaust and cc volume, it's not known why it is listed at 245hp for 1973. In fact, the LS6 (optional motor) that was available in 1971 was one of the highest-output 454 engines in production for its configuration. 3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug 3964292 1970 454 Closed 109cc 450 LS-6, 3994025 1971 454 Open 118cc 425 LS-6, 3994026 1971 454 Open 118cc LS6 6258723 1971 454 Open. Under the hood is a 454 LS6 Crate engine with rectangular-ported heads, forged crank, pink rods, TRW pistons, Griffin aluminum radiator, MSD ignition, Edelbrock intake and 600 carb, William's headers, Scott's 16" electric fan, high torque electric starter, Edelbrock cam and lifters, Austin's mufflers, 3" exhaust Crane Roller timing chain, and many more. 7L LS6 is the most powerful Gen. Although rebuild specs aren. From there the buyer selected the RPO LS6 454 engine that cost an additional $263. holley 4150hp carb-dual feed 950cfm. A 30 % increase in horsepower, torque and fuel economy is seen over carburetion. Type: ohv V-8. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. Brake Horsepower, Advertised: 425 @ 5,600 rpm (325hp Net) Maximum Torque: 475 lb-ft @ 4,000 rpm. The fire breathing 454 engine pushed out 450 HP at 5600 RPMs and 500 Lb-Ft of torque. 1956 Chevrolet 210 Delray Club Coupe Pro Street that started it's life as a rust-free Oklahoma car. 540" lift generates a nasty idle. When accompanied with a 3. 90 inches and a stroke of 3. lpg new pair toyota 4 runner tundra tacoma land cruiser prado t-100 3. Follow along as we show the major components of an LSX 454. Only 188 Corvettes were built with the 454 CID 425 HP LS6 engine option, less than the total 3-year production of L88’s! The Collection will present a great group of documented LS6 and ZR2 optioned Corvettes. And the car was downright common compared to many other exotic muscle cars. Our Factory Replacement Series LSx short blocks are a great solution for your worn out LS factory power plant. Base price: $3,800. 00; Chevy 383 / 350 HP 4 Bolt Performance TBI Balanced Crate Engine Truck Camaro $ 3,595. 00 NEW GM LSX ENGINE BLOCK (WE WILL MATCH OR BEAT ANY ADVERTISED PRICE ON LSX ). competition cams hp cam. The LS3’s cylinder heads use 2. We have a 1969 Chevrolet Camaro ZL1 powered by all aluminum 427 V8 paired with Turbo 400 automatic going heads up against a 1971 Chevrolet Corvette fitted with 454 LS6 with aluminum heads mated to Muncie 4-speed tranny. favorite this. I know it is a GM highperf crate engine with solid lifter cam. 25-to-1 compression ratio and wielded 450 horsepower and 500 foot-pounds of torque in the 1970 Chevelles and Camaros. The 1970 production models of the 454 put out the most horsepower with the LS5 claiming 360 horsepower and the LS6 putting out a mighty 450 horsepower. 5 versions of the big block was offered in 1970. The threads for the spark plugs are way. Cylinder Head, Cast Iron, Assembled, 121cc Chamber, 308cc Intake Runner, Chevy, 396, 402, 427, 454, Each. * The 1973 454 Corvette engine was rated at 270hp. L88 ZL1 427 BBC Rectangle Port Aluminum Heads 3946074 074 L89 LS6 396 454. LS6 Cylinder Head Specs; 2001-04 Casting Numbers: 12564243: Material: Aluminum: Combustion Chamber Volume: 65cc: Intake Port Shape: Cathedral: Intake Runner Volume: 210cc: Exhaust Port Shape: D-Port: Exhaust Runner Volume: 75cc: Intake Valve Diameter: 2. gasoline (petrol) engine with displacement: 7443 cm3 / 454. By the way, you couldn’t order A/C in the 1970 LS6 optioned Chevelle. The full-size models could also be ordered with the LS5 version of the 454, which was available in Corvettes and the Chevelle SS 454 as well. have a few of these ls6 engines and one super rare ls7 465hp. There is no hiding the fact that this truck was meant to race. Am I right with this? Thanks Vaughn. Cam off the top of my head where solid lifter with 242* at. Specs and Options. The combination of a beautifully reproduced body with the FAZER series chassis can’t be beaten. Power Front Disc Brakes. Connecting Rod 50 ft. 200-inch titanium intake valves and 1. Here is a diagram of some important bolt identifying features. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. In 1970, Chevrolet planned to introduce into its performance cars, especially the Corvette, a 454 cubic-inch displacement engine dubbed the LS7. 000: 465 hp (347 kW) LS7: 1970: 22: 454: 4. 000: 270 hp (200 kW) LS5: 1972: 25: 454: 4. It was rated at 360 hp (or 390 in Corvette) with a 10. 5L DOHC LX5 90° V6. 25:1 for the LS1 to 10. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. Katech CNC Ported Cylinder Heads for LS1, LS6, LS2, Trucks, LS3, L92, LS7, LT1 and LT4 Katech vLog - The Streetspeed717 Z06 chassis dyno and shop projects update Katech vLog - Prepping your car for a track day. This new head will also be an excellent enhancment for the LS6 in the coming, Cadillac CTS-v and it's likely to bolt on to the six-liter, LS2 in the 2005, C6. It's perfect for turbocharged, or normally aspirated applications. 8mm race grade wires with insulators and plugs. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Head Bolt Size 1997-2003. Horsepower @ rpm: 450 @ 5600. 4L-454ci-V8 Engine Torque Specs. Engine Specs Type: V8 Valve Location: In Head Bore / Stroke: 4. Its rated output was right in between the base small-block 350-ci engine (270 hp) and 454-ci LS6 (425 hp). Fortunately, the Corvette engineers were able to get the LS6 454 approved for the 1971 model year with the same high lift. 4 L) with a 4. 100: 1800: 346-3622LB6F-610 58. Sold intake to pan, balancer to flexplate, 14395. LSX/L92 Cylinder heads (6 bolt) with head studs. 00 A31 Power Windows 4,813 63. Part # ERSE112000. Valve Lifters: Solid. Just to add to my other post on the 70SS that I am looking at. The L76/L92/LS3 cylinder heads use 2. The LS6 is a higher-output version of GM's LS1 engine and retains the same capacity. There are also 3 different bolt patterns for the flywheel/flexplate : 6-bolt, 8-bolt and 9-bolt. 000: 270 hp (200 kW) LS5: 1972: 25: 454: 4. Both share the same overall engine displacement of 346 cubic inches (5. Open: 118cc: bowtie aluminium mkIV gen. port 335cc. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. Big Block Chevy Cylinder Heads Open vs. However the large valves (which utilized hollow-stem technology) used in these heads limited the engine’s maximum rpm to 6,600. 25:1 compression ratio due to its forged steel crankshaft and forged aluminum connecting rods. 251 in (108. In many regards, the LS6 was very closely related to the LS1, especially in configuration. 76" STROKE (used on '65-'90 Mark IV 366T, 396, 402, 427 or 427T). Our Factory Replacement Series LSx short blocks are a great solution for your worn out LS factory power plant. 1 seconds or 0-100kph in 6. There is no hiding the fact that this truck was meant to race. I don't claim to be an expert about engines and am simply sharing some of the information that I've compiled from many different sources. drivetrain: 454 ci generation v block with a 4 bolt main; estimated over 500hp. Then talk with us about the restoration photos and receipts (and where to find the original matching numbers LS6 block and heads). I know it is a GM highperf crate engine with solid lifter cam. ATK HP451P Chevy 454 Base Engine 500HP, Call 866-721-2315 to Speak with an ATK Crate Engine Specialist. If the last 3 letters on the front engine pad are CRR [I can't really read the middle letter] then its a ls6 454 out of a 70 Chevelle with a automatic trans. ” And with 454 cubic inches of displacement, the Turbo-Jet provides a lusty torque output over the entire RPM operating range. Its rated output was right in between the base small-block 350-ci engine (270 hp) and 454-ci LS6 (425 hp). 7 liters (346 cu in) of displacement. Could someone list the engine specs for a 1970 454 LS6 engine. The LS6 designation was also used on a 454 CID Chevrolet Big-Block engine of the 1970s, as well as an iteration of the GM Iron Duke engine from the late 1970s. For the pure enjoyment of R/C car driving, the combination of a beautifully reproduced car body with the FAZER series ch. 0L, aluminum small block engine. The ultimate Chevrolet motor that would be equipped was the 454 LS6 which was conservatively rated at 450 horsepower. In 1970, Chevrolet planned to introduce into its performance cars, especially the Corvette, a 454 cubic-inch displacement engine dubbed the LS7. Restored to original specifications, it is equipped with the matching numbers LS6 454/450 HP solid-lifter big block engine and matching numbers Muncie M22 “Rock Crusher” 4-speed transmission. Power Steering. Today 38 years after introduction the small-block is the most popular engine in the enthusiast market with the vast array of performance parts available to turn them into a mild 325 horse power to a wild tire smoking stroker engine with 510 horse power. Custom COMP blower cam. The famed LS6 454 from the 1970 Chevelle was initially said to be part of the 1971 model year, though none were put into any of the ’71 Chevelles. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. Live help available 7:00 am – 4:pm CST. like the vortec. Having trouble finding the correct spark plug. , 1970 LS6, factory 450/465 hp454 c. E112000 - Erson Cams - LS HYDRAULIC ROLLER LSRH-256-1. The threads for the spark plugs are way. The 454 big block is a true legend of an engine that has been the base for many of the fastest, highest HP builds in the history of hot rodding. The block also has 10606xaa stamped above the timing cover. It was also frequently manipulated up or down by the manufacturer. But the LS6 454, which also cranked out 500 lb-ft of torque, was a radical as it got. Wanting to maximize power, we even installed a. Looking forward to seeing these in action. 00; Chevy 454 / 450 HP High Performance Balanced Crate Engine $ 4,395. Once your usable cores have made their way to us, LME will refund the cost of the cores. 44 seconds @ 108. Pontiac/chevy aluminium small port /race: 10051128: 1990-94: 454: Semi Open: 72cc: IP 400cc, bowtie, sym port: 12363401: 1996-up. 010 bored 8. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. 3 402's (still marketed as 396 engines). Ford D20E heads with 7cc valve reliefs, dominating the class ! Cemented block and suspected running race gas as we have no fuel testing yet. It was rated at 360 hp (or 390 in Corvette) with a 10. 85 C08 Vinyl Covering (for auxiliary hardtop) 832 63. 3L), 346 cid (5. Chevy LS6 Engine Specs LS Family = Gen. 4L) 8 items ; 502 (8. it was a 454 version of the L-72 1966 425 HP 427 ci corvette engine. 2 L) 572 cu in (9. It was pulled from a buddy's 10 second 1970 Camaro, and is bolted to a TCI 350 Super Street Fighter transmission. (7) At least one 3916323 block has been found with older canister type oil filters in a June 1967 Chevelle. The casting number is 3964291. 015" 44: Most early specs included more up ramp than down ramp and this leads to a non-symmetric profile and throws. The two production models of Chevrolet's 454 V8 engine, the LS5 and LS6, produced 360 and 450 horsepower, respectively. The ultimate Chevrolet motor that would be equipped was the 454 LS6 which was conservatively rated at 450 horsepower. Wheelbase, inches: 112. (7) At least one 3916323 block has been found with older canister type oil filters in a June 1967 Chevelle. 65 seconds with a trap speed of 93. 16 degree oval spread port for 2. If the rest of the parts are matching then its worth a lot to a restorer. the cam/intake and heads. of big-block torque. 010 bored 8. Cheap Exhaust Headers, Buy Quality Automobiles & Motorcycles Directly from China Suppliers:Chevy LS LS2 LS3 LS6 LS7 Shorty Chevelle Camaro Stainless Steel Exhaust Headers Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. The fire-breathing Rat blew brimstone at the rate of 425 hp. The listed part numbered cams will not fit these models, so if you require a camshaft with the oiling groove. 000 450 hp (340 kW) LS6: 4-barrel: 1970: 21: 454: 4. Horsepower comes in at 425 with 500 lb. It's 450-hp rating even falls five short of the current SS Camaro's 6. This 454 cubic inch monster sported big valve square port heads, a solid lifter cam, and a huge Holley carburetor in order to produce 450 hp, the highest power figure for a regular production engine during the era. 9 inches Hip Room 48. The LS3’s cylinder heads use 2. big block bbc chevy 454 496 300cc oval port aluminum heads assem. 125 in (104. I cant get the RPM that the ls6 is getting though, its going up to 7000. The 1970 production models of the 454 put out the most horsepower with the LS5 claiming 360 horsepower and the LS6 putting out a mighty 450 horsepower. Connecting Rod 50 ft. big block Chevrolet engine suffix codes by minuit10. Inner studs - 4. The fire-breathing Rat blew brimstone at the rate of 425. LS6 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More. 200 or larger and comes standard equipped with lightweight 2. The 1970 LS6 Chevelle SS 454 has been called “The Ultimate Muscle Car… King Of The Streets” and, regardless of brand affiliation, muscle-car fans respect its 450 HP, 500 lb-ft LS6 engine. 60:1 full roller rocker arms Custom 1pc Flexplate Ported and polished Eaton M90 Supercharger with 2. In fact, the LS6 (optional motor) that was available in 1971 was one of the highest-output 454 engines in production for its configuration. We start with an all-new Chevy LS short block and crank, add a set of Scat 4340 forged steel rods, and top it off with a set of Speed Pro Hypereutectic Pistons. 550 long 50 ft lbs Windage tray nuts 28 ft lbs. The LS6 also carried over the bore of 3. Shuman reported that the SS 454 "was fitted with a 450-hp 454-cubic-inch engine, alluded to by the computer as LS6 (that's LS as in land speed. Conventional style cylinder heads are available in 26º, 24º, and 20º valve angles, and spread port heads are available in 18º, 16º, 14. 0005: Port Location: STOCK: Valve Head Diameter: 2. LSX 454 pump-gas engines with stock LS7 heads and conservative cam specs routinely exceed 650 hp and 590 lb-ft of torque on the dyno. 427 Anniversary Edition (19166392) Specifications : 454 Partial (12498778) Specifications: Circle Track Engine Specifications : 454 HO Engine (12498774) Specifications: CT350 Circle Track Racing Engine (88958602) Specifications : ZZ454 Engine (12498777) Specifications: CT355 Circle Track Racing Engine (88958603) Specifications. 1 L) 502 cu in (8. Like the true compression? Did it have forged domed pistons or flat top? Cam size duration and lift? Solid or Hydraulic lifters? What type of head (open or closed chamber) and valve sizes? Carburetor size? What type of intake? Please list any other important facts about these engines. 1970 Chevrolet Chevelle SS454 LS6 Tribute - 5978899324. 45 Z15 SS 454 package. like the vortec. E112000 - Erson Cams - LS HYDRAULIC ROLLER LSRH-256-1. Weight, lbs: 3,800. In 1970, Chevrolet planned to introduce into its performance cars, especially the Corvette, a 454 cubic-inch displacement engine dubbed the LS7. 80) or M40 ($290. Joshua Mortensen. M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40). 31 Ratio - CRW1017B2. The flow data below shows the superior performance of the PRC stage 2. The biggest performance option for 1970 was the "LS6 454"; it produced 450 HP @ 5600 RPM and built 500 lb-ft of torque @ 3600 RPM. Warning!!! If you are using ARP bolts, you MUST use their specs. The 454 for our 70 El Camino is rated at 450hp with boat oval port heads on it. It was rated at 360 hp (or 390 in Corvette) with a 10. LSX 454 Features: 3. Only 188 Corvettes were built with the 454 CID 425 HP LS6 engine option, less than the total 3-year production of L88’s! The Collection will present a great group of documented LS6 and ZR2 optioned Corvettes. Like the true compression? Did it have forged domed pistons or flat top? Cam size duration and lift? Solid or Hydraulic lifters? What type of head (open or closed chamber) and valve sizes? Carburetor size? What type of intake? Please list any other important facts about these engines. big block Chevrolet engine suffix codes by minuit10. We recommend a high rise dual plane with the center notched. Specs and Options. Current Rebates & Specials. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. The peanut-port heads received a light surface and performance valve job, but were not ported in any way. models have an oiling groove in the rear journal. 454 Big Block Performance Specs The original LS5 engine was introduced with 390 hp and 500 lb-ft of torque, while the LS6 was rated at 450 hp. Custom stainless intake & exhaust valves. The fire-breathing Rat blew brimstone at the rate of 425. Ive ran a catch can in the past The SECRET to a Healthy LS. Turbo-Jet 454-4 V8 – Like they say: “Nothing beats inches. Fuel system: 1 x 4bbl. 59 in (40 mm) exhaust valves. The heads date code to Dec 69 a couple weeks apart. 10” Main Bearing Diameter. Search Car Torque Specifications by Engine or Model. 125 Callies crankshaft. From there the buyer selected the RPO LS6 454 engine that cost an additional $263. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. Chevy 383 / 425 HP 4 Bolt Aluminum Heads Hi-perf Balanced Crate Engine $ 4,195. Live help available 7:00 am – 4:pm CST. If the rest of the parts are matching then its worth a lot to a restorer. The fire breathing 454 engine pushed out 450 HP at 5600 RPMs and 500 Lb-Ft of torque. 152169 68-74 427/454 PCV GROMMET 68-69 327/350 All, 70E Base 350, 68-69 427 Exc. In fact, the LS6 (optional motor) that was available in 1971 was one of the highest-output 454 engines in production for its configuration. 2L) 2 for 1997-04 LS1. No weird noises at startup and she holds idle well. The LS6-powered 1970 Chevelle SS 454 had none of the conveniences that 21st century muscle car enthusiasts have come to expect. This 454 cubic inch monster sported big valve square port heads, a solid lifter cam, and a huge Holley carburetor in order to produce 450 hp, the highest power figure for a regular production engine during the era. Head and Block Construction. I believe I have the engine you were inquiring about, here is what I have, 454 block casting # 14015445 4 bolt block, heads 6272990, crank 3867416, rods have 7/16" bolts, and pistons are trw forged dome pistons. Today 38 years after introduction the small-block is the most popular engine in the enthusiast market with the vast array of performance parts available to turn them into a mild 325 horse power to a wild tire smoking stroker engine with 510 horse power. Heavy Duty Clutch/Aluminum Heads: CTW: 402-4: 350-L34: TH-400 : CTX: 402-4: 350-L34: Manual-3/4 : CTY: 402-4: 375-L78: TH-400 : CTZ: 402-4: 350-L34: Manual-3/4: Heavy Duty Clutch: CZX * 400-2: 265-LF6: Manual-4: Monte Carlo: CRN * (2) 454-4: 360-LS5: TH-400: Monte Carlo: CRQ: 454-4: 360-LS5: TH-400 : CRR: 454-4: 450-LS6: TH-400 : CRS (1) 454-4: 450-LS6(w/L89) TH-400: Aluminum Heads: CRT: 454-4: 360-LS5: Manual M22 : CRU: 454-4: 360-LS5. The 1970 production models of the 454 put out the most horsepower with the LS5 claiming 360 horsepower and the LS6 putting out a mighty 450 horsepower. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. These are showing to be 1970 square port hi performance LS6 in my casting numbers book. LS7 Engine Specs: Performance, Bore & Stroke, Cylinder Heads, Cam Specs & More Posted by OnAllCylinders Staff on January 18, 2018 at 2:39 pm The LS7 is a Gen. 454: Semi Open: 72cc: IP 400cc, bowtie, sym port: 12363401: 1996-up. These were found in the the L88 427 - 430HP & LS6 454 - 450HP w/500 lbs-ft of torque. 4 V8 - [1972] has a top speed of 107 mph (172. C5751-120 COMETIC 4. 052” compressed. 3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug 3964292 1970 454 Closed 109cc 450 LS-6, 3994025 1971 454 Open 118cc 425 LS-6, 3994026 1971 454 Open 118cc LS6 6258723 1971 454 Open. 5 LS6 heads, an aggressive COMP 289LR HR14 cam and FAST LSRXT (truck) intake. 1/4 mile, sec. This is a 1970 Chevrolet Chevelle Classic Car in Tacoma WA posted on Oodle Classifieds. LS6 Specifications The high-performance LS6 454 equipped with a four-barrel carb had an 11. The all new Fazer Mk2 touring car FZ02L chassis has been designed for the pure enjoyment of driving. 25:1 for the LS1 to 10. 450-500 streetable horsepower is only $1500-2000 away once you got a good core to work with. US 1970 Chevrolet Chevelle Super Sport Documented Chevelle SS LS6 454 M22 4 Speed Year: 1970 Type of vehicle title: Clear Primary color: Green Mileage: 27 Transmission type: 4 Speed Manual. 1970 Chevelle SS454 LS6 Autumn Gold 1970 LS6 Original Spare Tire 1970 Chevelle SS396 L78 Black Cherry 1970 Chevelle SS454 LS6 Tuxedo Black El Camino Fresh from a Rotisserie Restoration completed in March 2013 to OEM specs. The biggest big-block Corvette which saw the light of day was the 390hp LS5. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. going very fast from point A to point B. But, for legions of Chevrolet fans, this car has it all: limited production, the baddest engine available, and enduring styling. The AMA specifications filed for COPO 9560 listed horsepower at 430 and shipping weight at around 3300 pounds. Under the hood sits a 454ci V8, "512" GM Block used for 454ci LS6 450hp V8. It's 450-hp rating even falls five short of the current SS Camaro's 6. 860 valves listed at 515cfm at. I am not sure what heads were used other than they were open chambered to lower the LS6 high compression pistons. The ultimate package was introduced that same year as Chevrolet offered the LS6 Turbo-Jet 454 cubic-inch big-block V8 engine with 450 horsepower, a $263. Head Room 37. A roller camshaft with. 90 inches smaller than many of the later Gen III and IV engines, and reduced the head compatibility for this engine. Cylinder Head, Cast Iron, Assembled, 121cc Chamber, 308cc Intake Runner, Chevy, 396, 402, 427, 454, Each. The initial 2001 LS6 produced 385 bhp (287 kW) and 385 lb⋅ft (522 N⋅m), but the engine was. Patriot Performance Stage II Cylinder heads for LS1 LS2 and LS6 engines. Note: All specifications listed apply to the 1971 Corvette LS6. The LS6 designation was also used on a 454 CID Chevrolet Big-Block engine of the 1970s, as well as an iteration of the GM Iron Duke engine from the late 1970s. MLS head gaskets. We can customize these specifications and components to your application, just give us a call at 812-576-2371. In 1970 there were other 454 engines used, notably is the LS-5 with rated hp at 345, 360, and 390 with oval port - "closed" chamber design heads. 3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug 3964292 1970 454 Closed 109cc 450 LS-6, 3994025 1971 454 Open 118cc 425 LS-6, 3994026 1971 454 Open 118cc LS6 6258723 1971 454 Open. 25:1 compression ratio, oval-port heads, Quadrajet carburetor, and a hydraulic valvetrain. The 427 L88 :thumbsup: vs the 454 LS6. 1970 Chevrolet Chevelle SS 454 LS6 Recreation. The 241 heads were used on 5. The LS6 designation was also used on a 454 CID Chevrolet Big-Block engine of the 1970s, as well as an iteration of the GM Iron Duke engine from the late 1970s. 75:1 compression ratio. The full-size models could also be ordered with the LS5 version of the 454, which was available in Corvettes and the Chevelle SS 454 as well. 454 Big Block Performance Specs The original LS5 engine was introduced with 390 hp and 500 lb-ft of torque, while the LS6 was rated at 450 hp. A third model of the 454, the LS7, was a crate engine and put out around 500 horsepower. The car is painted correct colour of of fathom blue with white stripes, I had bucket seat anchors welded into the floor so you could use bench or buckets. Chevrolet Performance’s 454 HO crate engine is classic in its own time, offering enthusiasts an affordable Big-Block combination with performance specs that will make you think it’s 1970 all over again — with 425 horsepower and 500 asphalt-wrinkling lb-ft of torque. 1956 Chevrolet 210 Delray Club Coupe Pro Street that started it's life as a rust-free Oklahoma car. It was rated at 360 hp (or 390 in Corvette) with a 10. , 1970, factory 375 hp427 c. After a fresh coat of paint, the 454 was almost ready to rock, all it needed was the major power producer. Case-in-point were two distinct DOA examples: the fabled LS7 454, along with something called an “LJ2”, which appeared to be a tri-power version of the 1970 Chevelle LS6 engine. Under the hood sits a 454ci V8, "512" GM Block used for 454ci LS6 450hp V8. BluePrint Engines 496 Stroker Crate Engine | Big Block Chevy 454 Style | Dressed Longblock with Carburetor | Iron Heads | Flat Tappet Cam. I also set this cam up to work in NA cars with different specs,. 030-over 454). Displacement, cid: 454. From the drivers seat this square body Chevy pickup looks & feels original but once you fire it up you can feel the mean sounding Big Block 454! Mechanical: 454 Big Block Chevy V8 (Cam) 700R 4 Speed Automatic transmission Oval Port LS6 Heads Roller Rocker arms Holley Carb & Aluminum Intake manifold Serpentine Belt System. GM's BEST made quality rod for any high performance Big Block They have been balanced & reconditioned. this head fits years 93-04. 00 MORE INFO. Casting # CID Year Model Applications Comments; 340220: 427: 68-76: Truck: 361959: 454: 73-75: Chevelle: 361959: 454: 73-76: Passenger: 361959: 454: 75-85: Truck. (6) In 1971 454 applications, the LS6 with 4-bolt mains was only available in the Corvette. As with many high performance engines during the muscle car wars, there were lots of rumors flying around in regards to actually how much horsepower the 454 engines put out as opposed to what Chevrolet was reporting. Crankshaft Stroke: 4. 4,475 Chevelle owners selected the LS6 engine. Our Factory Replacement Series LSx short blocks are a great solution for your worn out LS factory power plant. Two legendary codes L88 & LS6. Chamber Volume. 152169 68-74 427/454 PCV GROMMET 68-69 327/350 All, 70E Base 350, 68-69 427 Exc. 2 L) 572 cu in (9. 5:1 compression ratio, rectangle port heads, an aluminum intake manifold, and a big Holley carburetor. The Camaro has a 427 cubic inch engine with an aluminum block and aluminum heads, a Turbo 400 transmission, and 4. Head Retaining Bolt 12Y 106lbin Coolant Temperature Sensor 20Y 15lbft Crankshaft Balancer to Crankshaft Retaining Bolt • First Pass 150Y 110lbft • Second Pass Loosen360Degrees • Third Pass 80Y 59lbft • Fourth Pass(Bolt with flanged head. hooker custom heads. 4 L) 496 cu in (8. The LS6 designation was also used on a 454 CID Chevrolet Big-Block engine of the 1970s, as well as an iteration of the GM Iron Duke engine from the late 1970s. To put a real 500HP from a 454 in perspective, it's worth pointing out that the 1970 LS6 was conservatively factory rated at 450HP at a lower than optimal rpmwith a more. It was the entry-level big block of the 1971 model year, and arriving right in the middle of the big block’s reign, it was a great product and marketing move for Chevrolet. 19" * Exhaust valve size ~ 1. Has square port heads, LS-6 low rise aluminum intake and all the internal parts are new GM LS-6 spec parts. genuine gm ls6 450hp engine. Not only does it have Chevrolet’s most powerful big block 454/450 horsepower, but it also has an original factory M22 Rock Crusher 4-speed transmission. GM OE engines built with unrivaled quality Tested to meet or exceed GM OE specifications, only GM Genuine Parts offers GM engines designed specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. See next page for more technical specifications including specific years and engine sizes PN 2050 -- Small Block Chevy, Husler Header " 410" Sprint Car Application, 7 Bolt Pattern "18 Degree" Head, 1-15/16""w x 1-13/16"h Exhaust Ports, 6 Piece Set/3 Pieces Per Side. 8 mm) bore spacing is retained, requiring pressed-in cylinder liners. Jim Wick LPX. Only 188 Corvettes were built with the 454 CID 425 HP LS6 engine option, less than the total 3-year production of L88’s! The Collection will present a great group of documented LS6 and ZR2 optioned Corvettes. PN 2003 -- Chevrolet, Big Block, 396/6. It's perfect for turbocharged, or normally aspirated applications. It was rated at 360 hp (or 390 in Corvette) with a 10. 4L-454ci-V8. 88" * Combustion chamber ~ 109. 251 in (108. When it comes to Chevrolet big-block V8 engines, it’s extremely tough to pick the top dog. Inner studs - 4. going very fast from point A to point B. and a tiny cam. Patriot Performance Stage II Cylinder heads for LS1 LS2 and LS6 engines. (6) In 1971 454 applications, the LS6 with 4-bolt mains was only available in the Corvette. 265, fits 1970 1971 Corvettes with 454 Big Block. Buy COMP Cams 54-454-11 at JEGS: COMP Cams LSR Rectangular Port Hydraulic Roller Camshaft GM Gen III/LS1/LS2/LS6 1997-Present (Three bolt) Lift:. it was a 454 version of the L-72 1966 425 HP 427 ci corvette engine. Jim Wick LPX. Comments: The 1971 was not immune from the general collapse of muscle car performance. and the original 12 bolt rear end with 3. Just to get the Bow Tie’s biggest bruiser cost at least an additional $988. 00 NEW GM LSX ENGINE BLOCK (WE WILL MATCH OR BEAT ANY ADVERTISED PRICE ON LSX ). All flow numbers for CHW — Cylinder Head Works heads come from them Web Site updated April '10. gm 3963512 engine block 454 ls6 copo yenko 427 512 block 4-bolt (choose date) Price- $4195. The car weighs roughly 4,000 lbs. 215 hp @ 5600 rpm; 234 tq @ 4400 rpm; 6500 rpm redline; Aluminum heads, Aluminum block; Dual-overhead camshafts, driven by chains; 4 valves per cylinder; 9. 3:1 compression; 89. Advertised Compression Ratio: 9. GM OE engines built with unrivaled quality Tested to meet or exceed GM OE specifications, only GM Genuine Parts offers GM engines designed specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. this head fits years 93-04. bbc-oval-272. Open: 118cc: bowtie aluminium mkIV gen. 7:1: Recommended fuel: 92 octane: Maximum rpm: 6500: Reluctor wheel: 24X. The LS3’s cylinder heads use 2. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. 100: 1800: 346-3622LB6F-610 58. 89 in a 9" 31 spline Ford rearend), the converter is supposed to be somewhere from 2400 to. Engine code "CJK" with an asterisk (*) indicates a new code during the 1971 model year, replacing the earlier listed "CGT" code. Contest results and build update!. The 454 motor is built to 450 hp LS-6 specs. Only 188 Corvettes were built with the 454 CID 425 HP LS6 engine option, less than the total 3-year production of L88’s! The Collection will present a great group of documented LS6 and ZR2 optioned Corvettes. 050 hyd roller, very popular engine. Kyosho Fazer Mk2 touring car FZ02L chassis with 1970 Chevelle SS 454 LS6 The Kyosho 1970 Chevelle SS 454 LS6 Fazer Mk2 ReadySet was created for the pure enjoyment of R/C car driving. 000 450 hp (340 kW) LS6: 4-barrel: 1970: 21: 454: 4. 4,475 Chevelle owners selected the LS6 engine. 19331574 469 HP @5500 RPM. 450-500 streetable horsepower is only $1500-2000 away once you got a good core to work with. of big-block torque for a lot of big block fun. #3863143 for,396 c. I believe the LS6 used the SEMI-OPEN 118cc Chamber Head and these heads are more like L78 396/402 or L72/L88 427 material. ENGINE COMPARTMENT: Restored and detailed to factory new condition. Two legendary codes L88 & LS6. (It started life at 450HP, but have no idea what it has now. 396-454 hyd p/n 3874872 LS6 p/n 3904366 @. The SS 396 Chevelle included a 350 horsepower Turbo-Jet 396 V8, special suspension, "power dome" hood, black-accented grille, resilient rear-bumper insert, and wide-oval tires on sport wheels. Head Room 37. The car weighs roughly 4,000 lbs. The 454 motor is built to 450 hp LS-6 specs. It requires a head gasket bore of 4. 90 inches smaller than many of the later Gen III and IV engines, and reduced the head compatibility for this engine. 152169 68-74 427/454 PCV GROMMET 68-69 327/350 All, 70E Base 350, 68-69 427 Exc. a lot more grunt than a 283 of course if you wanna build it up the sky is the limit. phpCode correct Brands Hatch G. The L76/L92/LS3 cylinder heads use 2. It is based on the LS1 that powers the convertible and coupe Corvettes; both engines have 5. 1970 Chevrolet Chevelle SS454 LS6 Tribute - 5978899324. The all new Fazer Mk2 touring car FZ02L chassis has been designed for the pure enjoyment of driving. Open: 118cc: bowtie aluminium mkIV gen. Engine Oil: 110 ft-lbs. Improved manufacturing efficiencies made these heads cheaper to manufacture than the outgoing LS6 heads. 1971 Corvette LS6 454 The 1971 Corvette LS6 454 was the top performer of all the Corvettes for the 1971 model year. Each Golen Engine Performance Street Engine comes standard with a “ Three Year no Mileage Limit Warranty ” to keep you confident and covered!. Few other muscle cars could rival the power of the LS6. ENGINE COMPARTMENT: Restored and detailed to factory new condition. The Fazer chassis has gone through a full transformation. Duration was (intake) 316 degrees (exhaust) 302 degrees Question is, at what inch lift? Thanks for your help. RPO# DESCRIPTION QTY RETAIL$ 19437 Base Corvette Coupe 10,668 $5192. It is an all-iron engine (block and heads) with two valves per cylinder. Under the hood there is General Motors 454 cubic-inch, 7. So feast your eyes on a 1970 Chevrolet El Camino SS LS6 just posted by Red Hills Rods & Choppers in St George, Utah. 265, fits 1970 1971 Corvettes with 454 Big Block. 4 L (454 cu in) Big-Blocks, but the stroke was upped by 9. add to cart. she was built for one reason and one reason only. 5:1 in the LS6. And the car was downright common compared to many other exotic muscle cars. port heads,, but only 8. I also set this cam up to work in NA cars with different specs,. Its option list includes the 450 horsepower 454 V8, the M22 Rock Crusher transmission, 12 bolt with 4. Representative Performance. gm performance 454/502 aluminum heads with oval ports. 454/450HP LS6 Engine - Block Casting # 3963512, Block Date Code 1-19-9 (September 19th, 1969) // Cylinder Heads Casting #s 3964291, Date Codes 1-11-9 & 1-12-9 (September, 69) TH400 3-Speed Automatic Transmission. They are the foundation for GM's 454/425 hp crate engines. 3) Horsepower/Torque Curve. Pushrod Length: 7. 0 1986-95, Ford 4. TBI 454 that runs quiet and smooth. 10 Positraction rear axle • Rare factory-correct Tuxedo Black exterior • Black bench seat interior • Original partial build sheet found during restoration. The flow data below shows the superior performance of the PRC stage 2. *You got it and thats why it works so good in a stock head LS1 combo. its original numbers matching M22 4 speed transmission. Rocker Arm Mounting Style: Pedestal: Rocker Arm Style: Die-Cast, Roller Fulcrum: Rocker Ratio: 1. have a few of these ls6 engines and one super rare ls7 465hp. It is mandatory for you to contact Golen Engine Tech Support before starting your LSx 454 crate engine for the first time and you can reach our Tech Support Line at 1-800-591-9171 ext 2. This year’s Gold Collection will salute the 1971 Corvette LS6 engine option. 152169 68-74 427/454 PCV GROMMET 68-69 327/350 All, 70E Base 350, 68-69 427 Exc. Heads & THM. The Corvette, on the other hand, has a 454 cubic inch engine with aluminum head, a M-22 transmission, and 4. We start with an all-new Chevy LS short block and crank, add a set of Scat 4340 forged steel rods, and top it off with a set of Speed Pro Hypereutectic Pistons. 600-inch Ferrea Super Alloy exhaust valves. 10 ratio rear end, the F41 suspension package and the 6,500 red line tachometer all wrapped in Tuxedo Black paint. Live help available 7:00 am – 4:pm CST. 25-to-1 compression ratio and wielded 450 horsepower and 500 foot-pounds of torque in the 1970 Chevelles and Camaros. 45 Z15 SS 454 package. I will be running this in a 30 Model A roadster, with a turbo 400 (billet clutch hub, Red Altos, Kolene steels, & shift kit), the gears are 3. If you get an AEM fuel rail, you can fit bigger. 1970 Chevrolet Chevelle SS454 LS6 Tribute - 5978899324. See full list on corvettemuseum. '69 issue of MT, A. 030-over 454). Other LS6 454 I've done were open chamber heads, this is closed. Main Bearings 110 ft. 8L), 325 cid (5. 7:1: Recommended fuel: 92 octane: Maximum rpm: 6500: Reluctor wheel: 24X. M22 is Heavy-Duty Four-Speed Transmission; THM means Turbo Hydra-Matic Transmission (M40). Cylinder Head: Intake: Exhaust (left) Exhaust (right) 350 - 300 HP (early) Base: 3932386: 3927186: 3927184: 3872765: 3932461: 350 - 350 HP (early) L46: 3932386: 3927186: 3927184: 3872765: 3932461: 350 - 300 HP (mid) Base: 3956618: 3927186: 3927184: 3872765: 3932461: 350 - 350 HP (mid) L46: 3956618: 3927186: 3927184: 3872765: 3932461: 350 - 300 HP (late) Base: 3970010: 3947041: 3927184: 3872765: 3932461. Multiport Fuel Injection The next most current fueling method is the Multiport Fuel Injection (MPFI). Its is a factory pearl white interior. Casting # CID Year Model Applications Comments; 340220: 427: 68-76: Truck: 361959: 454: 73-75: Chevelle: 361959: 454: 73-76: Passenger: 361959: 454: 75-85: Truck. 10 Positraction rear axle • Rare factory-correct Tuxedo Black exterior • Black bench seat interior • Original partial build sheet found during restoration. The most important part of your restoration. ENGINE COMPARTMENT: Restored and detailed to factory new condition. lpg new pair toyota 4 runner tundra tacoma land cruiser prado t-100 3. 19" * Exhaust valve size ~ 1. Our short blocks are in high demand among racers of all types worldwide. As for buying a crate motor if can be down. Finished in Original Tuxedo Black with Black Interior Matching Numbers LS6 454/450 HP Solid Lifter Engine. The LS6 designation was also used on a 454 CID Chevrolet Big-Block engine of the 1970s, as well as an iteration of the GM Iron Duke engine from the late 1970s. 0:1 compression Total Seal chromoly rings Diamond forged 19. are killing the power. *You got it and thats why it works so good in a stock head LS1 combo. The LS6 also carried over the bore of 3. 152169 68-74 427/454 PCV GROMMET 68-69 327/350 All, 70E Base 350, 68-69 427 Exc. In 1970 there were other 454 engines used, notably is the LS-5 with rated hp at 345, 360, and 390 with oval port - "closed" chamber design heads. All flow numbers for CNC Heads UK come from their Web Site. The LS5 454 was a $279 extra for the SS group. Head Room 37. Now, GM Performance Parts has a 454 cubic inch Chevy crate engine that is way up on power and low on price. New heads for our 454 Vette. she was built for one reason and one reason only. Powerfire Ignition CDI Ignition Box, Powerfire I and Powerfire II Distributors and a complete line of Ignition Accessories. LSX 454 pump-gas engines with stock LS7 heads and conservative cam specs routinely exceed 650 hp and 590 lb-ft of torque on the dyno. 00" Heads ~ Casting number 3964291 * Closed chamber square port cast iron * Intake valve size ~ 2. Horsepower comes in at 425 with 500 lb. Closed-chamber cylinder heads have small combustion chamber volumes for high compression ratios, with even mildly domed pistons. 622: GM LS Stock stroke crankshaft 3. This big block engine was an enlarged version of the L88, with an aluminum-head block. This head is our take no prisoners LSX cathedral shaped offering and its focus is large displacement combinations (415 - 454 CID) with a minimum bore size of 4. 1971 Corvette LS6 454 The 1971 Corvette LS6 454 was the top performer of all the Corvettes for the 1971 model year. 00 A31 Power Windows 4,813 63. Base price: $3,800. the ground up. The ultimate Chevrolet motor that would be equipped was the 454 LS6 which was conservatively rated at 450 horsepower. GM OE engines built with unrivaled quality Tested to meet or exceed GM OE specifications, only GM Genuine Parts offers GM engines designed specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle. 1970 chevelle ss 454 ls5 built to to highier ls6 specs,with 074 aluminum heads period correct 512 block,rebuilt turbo 400 with 2800 stall,12 bolt posi. of big-block torque. I read that 454's from 76-80 had 380hp and 410ft-lbs of torque, 81-86 had 230hp and 385 ft-lbs of torque. 000: 270 hp (200 kW) LS5: 1972: 25: 454: 4. • Totally restored to original factory specifications • Restored by Jen-Jacs Restoration in Savannah, GA • Original rebuilt LS6 454/450-hp engine • M22 close-ratio 4-speed transmission • 4. the intake manifold was the "sunken" type because the engine was originally set to be put into a corvette and the manifold was necessary to clear the corvette hood. Only 188 Corvettes were built with the 454 CID 425 HP LS6 engine option, less than the total 3-year production of L88’s! The Collection will present a great group of documented LS6 and ZR2 optioned Corvettes. Posted on February 7, 2021 by. phpCode correct Brands Hatch G. The all new Fazer Mk2 touring car FZ02L chassis has been designed for the pure enjoyment of driving. 3946074 1969-71 396/402/427/454 Open 118cc 375 L-89 430 L-88/ZL-1 425, 465 LS-6/LS-7 3964291 1969-70 396/402/427/ Closed 109cc 396/402/427/454 large or small spark plug 3964292 1970 454 Closed 109cc 450 LS-6, 3994025 1971 454 Open 118cc 425 LS-6, 3994026 1971 454 Open 118cc LS6 6258723 1971 454 Open. These were found in the the L88 427 - 430HP & LS6 454 - 450HP w/500 lbs-ft of torque. peanut ports have been proven to suck, just ask any of the 454ss guys, they all swap to aluminum or 049 heads or vortec's. big block bbc chevy 454 496 300cc oval port aluminum heads assem. 90 inches and a stroke of 3. 25:1 compression, 4 bolt mains, etc. Closed Chamber - A good way to describe big-block heads is to categorize them as open or closed chamber. Live help available 7:00 am – 4:pm CST. Overhang (Front) 40. Ford D20E heads with 7cc valve reliefs, dominating the class ! Cemented block and suspected running race gas as we have no fuel testing yet. 427 Anniversary Edition (19166392) Specifications : 454 Partial (12498778) Specifications: Circle Track Engine Specifications : 454 HO Engine (12498774) Specifications: CT350 Circle Track Racing Engine (88958602) Specifications : ZZ454 Engine (12498777) Specifications: CT355 Circle Track Racing Engine (88958603) Specifications. (6) In 1971 454 applications, the LS6 with 4-bolt mains was only available in the Corvette. 90 inches smaller than many of the later Gen III and IV engines, and reduced the head compatibility for this engine.