Forged 4032 alloy pistons for 3 5/8″ big bore Knuckle, Pan and Shovel engines.
Good for strokes from 4 1/4″ to 4 3/4″ or 88 to 96 cubic inch engines
General compression ratio of 9.5 to 1. This ratio will of course vary with the stroke of the engine. It is always best to oil the engine out to see what you really have.
Sizes Available are STD, +.005″, +.010″