Chevrolet Performance Parts 12568774 - 454 HO 7.4 Liter Base+ Long Block Crate Engine

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BIG TORQUE ON A BUDGET
Chevrolet Performance's 454 HO crate engine is a Big-Block bargain, an affordable engine with performance specs that will make you think it's 1970 all over again, including 438 horsepower and 500 asphalt-wrinkling lb. ft. of torque.

A latest-generation block casting with four-bolt main caps is the Big-Block engine's foundation and features an all-forged rotating assembly for great strength and durability. It also uses a smooth hydraulic roller camshaft for excellent drivability and a broad performance range. Rectangular-port cylinder heads with large, 2.19/1.88-inch valves, round out the assembly.

The engine package includes a water pump, balancer, 14-inch flexplate and an aluminum intake manifold. Simply add a carburetor, ignition system and starter and the engine will be ready to roar. All of the necessary parts are available from Chevrolet Performance.

TECH SPECS

• Part Number: 12568774
• Engine Type: Chevy Big-Block V-8
• Displacement (cu in): 454
• Bore x Stroke (in): 4.250 x 4.000
• Block (P/N 19170538): Cast-iron with 4-bolt main caps
• Crankshaft (P/N 14096983): Forged steel
• Connecting Rods (P/N 19170198): Forged steel
• Pistons (P/N 10215228): Forged aluminum
• Camshaft Type (P/N 24502611): Hydraulic roller
• Camshaft Lift (in):.510 intake /.540 exhaust
• Camshaft Duration (@.050 in): 211° intake / 230° exhaust
• Cylinder Heads (P/N 12562920): Iron rectangular port; 118cc chambers
• Valve Size (in): 2.190 intake / 1.880 exhaust
• Compression Ratio: 8.75:1
• Rocker Arms (P/N 19260993): Stamped steel
• Rocker Arm Ratio: 1.7:1
• Water Pump (P/N 19168606): Cast-iron, long-style
• Flexplate (P/N 10185034): 14"
• Recommended Fuel: Premium pump
• Ignition Timing: 36° Total at 4,000 rpm
• Maximum Recommended rpm: 5,500
• Balanced: External
• Intake Manifold (P/N 19131359): Dual Plane

INSTALLATION NOTES

• Requires addition of carburetor, starter, fuel pump, distributor and ignition system (not included)
• Clutch linkage bosses are now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads, for clearance
• Comes with an externally balanced 14" automatic transmission flexplate; use flywheel P/N 14096987 and 11" clutch assembly for manual transmission applications
• Designed for pre-1976 street vehicles or any off-road vehicle
• Not intended for marine applications

Important: Distributor with melonized steel gear MUST be used with long-blocks and Partial engines with steel camshafts, or engine damage will occur.

All of Chevrolet Performance Parts' crate engines come with a 24-month/50,000 mile limited warranty.

Note: Special order, must be prepaid. Non-returnable. Non-refundable. Please contact Classic Industries by Phone, Fax or E-Mail to order this item.