1 SET KB213.STD/1 SET 4000AM8.STD

Keith Black Hypereutectic pistons are designed for high performance applications in marine, drag racing, circle track, street, or towing builds. Made from a low expansion 390 alloy with 16 percent silicon, these pistons allow for tighter piston-to-wall clearances. They feature fully machined heads, valve reliefs, Triple Spiral Lock Rings, and CNC machined pin bores. An accumulator groove improves compression ring seal, and machined oil returns, diamond-finished skirts, and mini grooves help reduce scuffing and overheating. Wrist pins and spiral locks are included, but piston rings (5/64 x 5/64 x 3/16) are sold separately.