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Chevrolet Performance HT502 Big-Block V-8 Crate Engine


Chevrolet Performance

Model #88890534

If you are thinking about repowering your trusty Big-Block-powered truck, do not 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.

This 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.

View Installation Instructions Here

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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