CHRYSLER 360 ROD 6.123 QUENCH HEAD +2.8CC 2V KB HYPER PISTON SET

The United Engine & Machine Co KB373.020 is a set of 8 hypereutectic pistons designed for Mopar small block LA and Magnum engines. These pistons feature a 4.020 inch bore and a stock stroke of 3.580 inches. They are constructed from hypereutectic aluminum and include a step head with two valve reliefs and press-fit or floating wrist pins.

They are intended to reduce blow-by, increase ring life, and eliminate cold start-up knocking. The pistons have a quench dome elevation of .085 inches, which requires machining for optimum quench and may need additional clearance for closed chamber cylinder heads.