454 HO

Cheverolet Performance's Most Econimical Big Block Crate Engine Delivers 500 LB-FT
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.

The foundation of the 454 HO is a brand-new, updated cylinder block, which incorporates many strength and performance design enhancements – making it a smart and economical alternative to rebuilding. We also add an all-forged reciprocating assembly for maximum durability, a roller camshaft, and a set of rectangular-port iron cylinder heads.

We deliver the 454 HO with a water pump, balancer, 14-inch flexplate, and aluminum intake manifold. Add a carburetor, ignition system, and starter and your budget Big-Block will be ready to roar. All of the necessary parts are available from Chevrolet Performance.

If you want the strength and convenience of the 454 HO bottom end, but want to add your own heads and induction system, use our 454 partial engine (P/N 12498778).

454 HO TECH SPECS
Part Number: 12568774
Engine Type: Chevy Big Block V8
Displacement (cu. in.): 454
Weight: 590
Horse Power: 425
Torque: 500
Trans*: C
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; 118-cc Chambers
Valve Size (in.): 2.190 Intake / 1.880 Exhaust
Compression Ratio: 8.75:1
Rocker Arms (P/N 12523976): Stamped Steel
Rocker Arm Ratio: 1.7:1
Water Pump (P/N 19168606): Cast Iron, Long Style
Flexplate (P/N 10185034): 14"
Recommended Fuel: 92 Octane
Ignition Timing: Base 4° BTDC, 26° Total
Maximum Recommended Rpm: 5500
Balanced: External

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

454 HO Warranty Detail PDF 

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