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SKU: 19433156

An affordable, high-performance alternative to rebuilding


If you’re thinking about repowering your trusty Big-Block-powered truck, don’t bother with a rebuild or a reconditioned used engine. Chevrolet Performance’s HT502 crate engine is an affordable alternative with more power and greater durability.


The HT502 is rated at 406 horsepower and a whopping 541 lb-ft of trailer-tugging torque. That’s more than the factory ever offered and more than you’ll get with a stock-type rebuild. It is uniquely suited to pre-1978 trucks, but is adaptable to a variety of applications.


We build the HT502 with a forged crankshaft, rods, and pistons for maximum strength, and they’re installed in a new version of the Big-Block cylinder block. It is updated for greater strength and performance capability. A conservative 8.75:1 compression ratio ensures pump-gas performance at all altitudes and engine loads.


Our assembly comes with heads and a balancer installed. An induction system, ignition, starter, water pump, and other accessories are required to finish the engine. All necessary components are available from Chevrolet Performance.

  • Horsepower

    406 HP

  • Torque

    541 LB-FT

  • Tech Specs

    Engine Type: Chevy Big-Block V-8

    Displacement (cu. in.): 502

    Bore x Stroke (in.): 4.47 x 4.00

    Block (P/N 19170540): Cast-iron with four-bolt main caps

    Crankshaft (P/N 10183723): Forged steel

    Connecting Rods (P/N 19170198): Forged steel, shot peened

    Pistons (P/N 12533507): Forged aluminum

    Camshaft Type (P/N 12552296): Hydraulic roller

    Camshaft Lift (in.): .480 intake / .483 exhaust

    Camshaft Duration (@.050 in.): 204° intake / 209° exhaust

    Cylinder Heads (P/N 12562917): Iron oval port; 118-cc chambers

    Balanced: External

    Valve Size (in.): 2.070 intake / 1.730 exhaust

    Compression Ratio: 8.75:1

    Rocker Arms (P/N 12523976): Stamped steel

    Rocker Arm Ratio: 1.7:1

    Flexplate (P/N 10185034): 14"

    Recommended Fuel: 92 octane

    Ignition Timing: Base 4° BTDC, 26° Total

    Maximum Recommended rpm: 5500

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