This is what all big-block crate engines should be: maximum power with a maximum return on your money invested. We started with the 454 that everyone loves, and pumped it up to a 502 cubic inch powerhouse that delivers gobs of low-end torque and top-end horsepower.

Even though the 502 is a great value, don’t think for a minute that we skimped on parts or validation of those parts to the highest standard in the industry. The 502 HO bottom end consists of a cast iron four-bolt block, forged steel crankshaft, forged steel connecting rods that have been shot-peened for durability, and forged pistons. A high-lift hydraulic roller camshaft controls the airflow through our legendary rectangular-port cast iron cylinder heads—more than enough air to fill those hungry 502 cubes! One other key engineering feature is that the final compression ratio comes in at 8.75:1, so that when outfitted with our 502 HO, your performance GM car will make tremendous power from just pump gas.

GM Performance Parts has completed this amazing crate engine with an aluminum dual-plane intake manifold, cast iron water pump, 6-quart oil pan (with windage tray), damper, and a 14" flexplate. Pick the carburetor, starter, and ignition system—all available from GM Performance Parts.

GM Performance Parts 502 C.I.D. HO 450 HP Engine Assemblies

• Displacement- 502
• Bore x stroke- 4.47 x 4.00
• Block- cast iron 4-bolt main caps
• Pistons- forged aluminum
• Camshaft Type- hydraulic roller
• Camshaft Lift- .510 intake/.540 exhaust
• Camshaft Duration(@.050in)- 211 intake/ 230 exhaust
• Cylinder Heads- iron rectangle port, 118cc chambers
• Valve Size -2.19 intake/1.88exhaust
• Compression- 8.75:1
• Rocker Arms- stamped steel
• Rocker Arm Ratio- 1.7:1
• Ignition Timing- base 8 degrees btdc, 30 degrees total
• Recommended Fuel -92 octane
• Maximum RPM- 5500
• Balanced- external
• Horsepower- 450@5250
• Torque-550@3500                                                  

Notes: This engine is not designed, nor intended to be used in any marine applications. Engines installed in vehicles registered and normally operated outside of the United States carry no warranty.            **This part is shipped via truck freight, additional shipping charges will apply. Multiple truck freight parts on an order may increase the shipping amount.   Note: Crate engine shipping charges have two components; Commercial Delivery (Free) & Residential Charge. The commercial shipping delivery to a freight terminal or commercial address ((provided the commercial address has a forklift to unload the product). If the product is shipped to a residential address there is an additional cost of $300 for the use of a lift-gate vehicle. Please call USM (888-876-7223) for any questions.   Truck Freight:    Most Truck Freight items have two standardized shipping rates, one rate to the terminal, another to your door. Additional fees apply for lift gate service; to avoid this you can choose terminal pickup.