KB HYP PISTON KIT SBC 400

Keith Black Hypereutectic pistons are designed for high-performance applications including marine, drag racing, circle track, street, or towing. Constructed from a low expansion 390 alloy with 16 percent silicon, these pistons allow for tighter piston-to-wall clearances. Features include a fully machined head with valve reliefs, triple spiral lock rings, CNC machined pin bores for accuracy, an accumulator groove for improved compression ring seal, machined oil returns, diamond-finished skirts, and mini grooves to reduce scuffing and overheating. Wrist pins and spiral locks are included (rings are not).