BBC Domed Piston Set 4.320 Bore +18cc

The BBC Domed Piston Set 4.320 Bore +18cc from Sportsman Racing Products delivers high-performance forged pistons engineered for big-block Chevy marine and automotive engines. This eight-piston set features a small dome profile and precisely machined 4.320-inch bore diameter, designed to maximize compression and combustion efficiency in high-output applications. The +18cc dome volume adds displacement benefits for serious engine builders and marine mechanics seeking competitive performance gains.

Each piston is forged for superior strength and heat resistance, critical for engines running sustained high RPM in marine service. The ring groove configuration (1/16 x 1/16 x 3/16 inch) accommodates standard compression and oil-control rings, ensuring proper sealing and oil management during aggressive operation. The domed design increases compression ratio, translating to improved torque development and fuel efficiency compared to flat-top alternatives. This piston set is compatible with standard BBC block dimensions and integrates seamlessly into engine rebuilds and performance upgrades.

Marine engine builders, offshore fishing boat operators, and performance enthusiasts rely on Sportsman Racing Products pistons for their durability and precision in saltwater and freshwater environments. Whether rebuilding a tired big-block for increased reliability or building a stroker engine for a center-console fishing platform, this piston set delivers the quality control and dimensional accuracy that professional builders demand. The BBC Domed Piston Set 4.320 Bore +18cc is ideal for custom marine applications where dome volume and bore diameter are engineered specifications rather than off-the-shelf compromises.