BBC Domed Piston Set 4.500 Bore +36cc

The Sportsman Racing Products BBC Domed Piston Set 4.500 Bore +36cc is a forged high-compression piston assembly designed for big-block Chevy marine and performance engines that require elevated combustion chamber volume. This set of eight pistons is ideal for boaters and engine builders looking to enhance displacement and compression dynamics in demanding marine applications, including tournament fishing rigs and offshore speedboats.

Each piston features a domed crown geometry that collectively adds 36 cubic centimeters of combustion chamber volume across the set, significantly impacting fuel mixture atomization and burn characteristics in big-block applications. The 4.500-inch bore diameter accommodates serious overbore machine work, while the ring groove configuration (1/16 x 1/16 x 3/16 inch) is optimized for conventional compression and oil control rings, supporting both naturally aspirated and supercharged engine builds.

This piston set is particularly beneficial for marine engine builders, tournament anglers running heavily modified big-block powerheads, and experienced shops performing custom BBC rebuilds. The forged construction ensures the material strength necessary to withstand repeated detonation cycles and the thermal cycling inherent in high-output marine duty.