KB HYP PISTON KIT SBC 400

Keith Black Hypereutectic pistons are a great choice for high performance marine, drag race, circle track, street or towing application builds. The low expansion 390 alloy with 16 percent silicon allows for a tighter piston to wall running clearance. They feature fully machined heads, valve reliefs, triple spiral lock rings, CNC machined pin bores, an accumulator groove, machined in oil returns, diamond finished skirts, and mini grooves. Wrist pins and spiral locks are included, but 5/64 x 5/64 x 3/16 rings are not. Specifications include a 4.185 bore size, 3.750 crankshaft stroke, 5.700 rod length, and a dish piston type. Compatible with SB Chevy 400 engines.