406 HP

@4200 RPM



541 LB-FT

@3200 RPM

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.

Connect & Cruise Powertrain System

Connect & Cruise Crate Powertrain Systems provide factory-matched engine-and-transmission combinations that include specially calibrated controllers and wire harnesses designed for retrofit installations in older vehicles. Connect and Cruise packages are available for a wide variety of crate engines which can be paired with an automatic or manual transmission.

Tech Specs

Part Number: 88890534 

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

Installation Guides

Find everything from the vital data about your engine’s capabilities to how to install it into your build.

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.

  • The Manufacturer's Suggested Retail Price excludes tax, shipping and installation. Individual retailer pricing may vary. Please see your local dealer or retailer for details.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.