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.
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
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