So for not too much more than a rebuild of your tired big block tow motor, you can step up to an all new HT 502 developed specifically for towing and heavy vehicle applications in 20 and 30 series light duty trucks. If you’re concerned about durability, don’t be. We’ve used the same four bolt block that we use in our other high performance 502’s, and filled it with a forged crankshaft, forged connecting rods, and forged pistons. It even has a steel roller camshaft, designed to work in perfect harmony with the high velocity cast iron cylinder heads. The heads, with their moderately sized valves and round intake ports, ensure maximum cylinder fill at low RPM, and that means excellent low RPM efficiency that equates to maximized low end power and torque.
The 502 Truck Conversion engine comes assembled, but needs your intake manifold, carburetor, water pump and distributor to run. It’s time to upgrade, and GM Performance Parts has your engine, the HT 502 is a High Torque workhorse that will get you, your trailer and your crew to the races without even breaking a sweat.
The HT 502 is intended for 1976 and earlier Chevrolet and GMC 20-series and 30 series trucks. The HT 502 is not intended for use with electronic fuel injection. When used with electroniic fuel injection, under certain heavy load and high altitude conditions, engine damage may occur due to a lean fuel mixture condition.
The HT 502 is not intended for marine use, and should only be used in 1976 and earlier pre-emissions street vehicles or any year off road vehicles.