SBC Domed Piston Set 4.155 Bore

The Sportsman Racing Products SBC Domed Piston Set 4.155 Bore is a high-performance forged piston assembly engineered for small-block Chevy marine and automotive applications. This set of eight pistons delivers the combustion chamber volume and dome profile necessary for efficient fuel burn and sustained power delivery in boats and performance vehicles operating under demanding conditions.

Built to exacting tolerances, this SBC piston set features a 4.155-inch bore diameter with a plus 4.00 cc dome configuration and ring groove geometry of 1/16 x 1/16 x 3/16 inches. The forged construction provides the durability and thermal stability required for sustained RPM operation in marine engines where reliability cannot be compromised. Ring groove specifications directly impact blow-by control and oil management, critical factors for longevity in salt-air and freshwater environments. The domed design increases compression ratio and combustion efficiency, translating to better throttle response and fuel economy across the operating range.

This piston set suits serious boaters rebuilding or upgrading small-block Chevy marine engines, as well as performance automotive users seeking reliable high-rpm capability. Whether you're restoring a classic inboard engine or upgrading a weekend cruiser's powerplant, quality piston selection defines the foundation of engine reliability. Sportsman Racing Products maintains tight specifications across all eight units, ensuring consistent compression and balanced combustion across all cylinders—essential for smooth operation and extended service intervals.