HT502 Big Block Crate Engine


Rebuilding alternative

Our HT502 crate engine is an affordable alternative with more power than our factory-installed Big-Block, producing a whopping 541 lb.-ft. of trailer-tugging torque.

PART NO. 88890534


406 HP @4200 RPM


541 LB-FT @3200 RPM  

More Torque

The HT502 is uniquely suited to pre-1978 trucks, but is adaptable to a variety of applications, and it’s built with our latest generation block casting with four-bolt main caps. An all-forged rotating assembly delivers exceptional strength and durability.

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.  

Installation Guides

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

HT502 Tech Specs

  • Part Number: 88890534 
  • Engine Type: Chevy Big-Block V-8
  • Displacement (cu. in.): 502
  • Bore x Stroke (in.): 4.470 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: Regular pump
  • Ignition Timing: Base 34° Total @ 4,000
  • Maximum Recommended rpm: 5500

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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.