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  • HT 502 Crate Engines
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MSRP

$7,454

Part No.

88890534

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For Off-Road &
STREET

6 Select
Available Mods

Power

Power
337
hp @ 4500 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 377 horsepower and a whopping 512 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.

HT502 DYNO

Click on the slider to see the torque and power ratings change with rpm.*

*Approximate values shown.

HT502 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

OWNER RESOURCES

Already own one, but lost some of the paperwork? We’ve got you covered with downloads and links for some of the more important documents below. You’ll find everything from the vital data about your engine’s capabilities to how to install it into your build, even all of the warranty information should you need to make a claim. And don’t forget, the best way we can make sure to get you the latest information on your specific part is to tell us which one you have by registering your engine. No matter what stage of your build you’re in — from shopping for the right part to that part having turned in a few miles — we have the information you need.

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  • HT 502 Crate Engines Installation

    INSTALLATION NOTES

    • Requires the addition of carburetor, intake manifold, water pump, starter, distributor, and ignition system (not included)
    • Clutch linkage bosses are now drilled and tapped. When using cast-iron exhaust manifolds, lower head bolts may need to be replaced with bolts with shorter heads for clearance
    • 502 engines now have a mechanical fuel pump boss!
    • Comes with an externally balanced 14" automatic transmission flexplate. Use externally balanced flywheel P/N 14096987 and 11" clutch assembly for manual transmission applications
    • Designed for pre-1976 street vehicles or any off-road vehicle
    • Not intended for marine applications
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FINISH OFF YOUR CRATE ENGINE WITH THESE SELECT PARTS

Download a catalog for a full listing of components and related parts.

SuperMatic 4L85-E Four-Speed
Transmission • P/N 19154550

Carburetor, Holley 770-cfm • P/N 19170093

Transmission Controller • P/N 19212657

Aluminum Water Pump, Short-Style • P/N 19168602

HEI Distributor • P/N 93440806

Intake Manifold, Oval Port (iron) • P/N 14097092

  • 1 Performance MSRP The Manufacturer's Suggested Retail Price excludes tax, shipping and installation.