KaleCo has produced the highest quality piston return spring to date! High temperance material coated in a thick rubber sleeve resists engine temperatures up to 2500'f. KaleCo piston return springs FORCE the pistons back into the motor, no longer rely on gravity! This effectively increases your revs, horsepower, and peak torque! You must buy one return spring per piston. Rotary engines require some cutting of rubber sleeve. A Chevy 350 showed 15hp / 15ft-LB gains from this mod!
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