SBC Dished Piston Set 4.040 Bore -19.4cc

The SBC Dished Piston Set 4.040 Bore -19.4cc by Race Tec Pistons is purpose-built for small block Chevy engines requiring precision forged components and controlled compression geometry. This eight-piece set delivers the consistency and durability demanded in high-performance racing, street performance, and rebuild applications where bore sizing and dome/dish configuration directly impact combustion efficiency and detonation control. Engineered for builders who demand repeatability across all cylinders, these pistons represent the foundation of a well-engineered bottom end.

Each piston features a dished crown design with a negative 19.4 cubic centimeter displacement, a critical specification that lowers compression ratio and reduces peak cylinder pressure—essential when running forced induction, nitrous oxide, or high-octane fuel blends. The 4.040-inch bore diameter accommodates overbore blocks and pairs with 1.5 x 1.5 x 3.0 millimeter ring grooves, a standard configuration that ensures proper ring sealing and minimizes blow-by. Forged construction throughout provides superior strength and thermal conductivity compared to cast alternatives, critical for sustained high-RPM operation and load cycling in competitive or heavily modified engines.

This piston set benefits engine builders, performance shops, and restorers working with small block Chevy platforms—including 350, 327, 305, and 283 cubic inch variants with overbore blocks. Installation requires precise honing to the 4.040-inch specification and proper ring gap setup to the manufacturer's tolerances; pairing with quality connecting rods, wrist pins, and ring sets ensures reliability. The -19.4cc dish volume makes these pistons ideal for moderate boost applications or naturally aspirated builds targeting controlled compression ratios between 9.5:1 and 10.5:1, balancing power output with detonation safety margins.