CHEVROLET 383 ROD 5.700 FLAT TOP +7CC 2V KB HYPER PISTON SET

The United Engine & Machine KB253.060 is a set of eight Keith Black hypereutectic pistons designed for high-performance applications. These pistons feature a flat top with two valve reliefs and a 4.060 inch bore size, intended for use in SB Chevy 383 stroker builds. The low-expansion 390 alloy with 16 percent silicon ensures a tighter piston-to-wall running clearance.

The pistons are fully machined with CNC-machined pin bores, accumulator grooves, and machined oil returns. They also have diamond-finished skirts and mini grooves to reduce scuffing and overheating. Wrist pins and spiral locks are included, but piston rings are sold separately.