1 SET KB121.020/1 SET 4000BM8.020

The Keith Black Hypereutectic pistons, MPN KB121KTM.020, are designed for high performance Small Block Chevrolet (SBC) 383 stroker engine builds. Crafted from a low expansion 390 alloy with 16 percent silicon, they allow for tighter piston-to-wall clearances. Key features include fully machined heads and valve reliefs, Triple Spiral Lock Rings, CNC machined pin bores, an Accumulator Groove for improved ring seal, and Diamond Finished Skirts with Mini Grooves to reduce scuffing. Wrist pins and spiral locks are included; rings are sold separately. Each piston has a 4.020" bore, 3.750" stroke, and a 28cc dish.