SBC Dished Piston Set 4.155 Bore -24.8cc

The SBC Dished Piston Set 4.155 Bore -24.8cc from RACE TEC PISTONS delivers precision-engineered forgings built for small block Chevy engines demanding high compression and aggressive combustion chamber design. This complete eight-piston set is engineered for serious builders and weekend racers who require repeatable, consistent performance across all cylinders. Dished pistons like these are purpose-built for applications where reducing compression height or managing combustion dynamics is critical to engine tuning strategy.

Each forged piston in this set features a 4.155-inch bore diameter with a -24.8cc dished crown geometry that lowers compression ratio while optimizing flame travel and burn efficiency. The ring grooves—measured at 1.5 x 1.5 x 3.0 mm—are machined to exacting tolerances to ensure proper ring sealing and minimize blow-by across the full RPM range. Forged construction provides superior strength compared to cast alternatives, enabling these pistons to withstand the thermal and mechanical stresses of boost, nitrous, or high-RPM naturally aspirated applications without risk of crown distortion or failure.

These pistons are ideal for engine builders customizing displacement, compression ratio, or combustion chamber profiles in small block Chevy platforms including 350, 383, and 427 builds. The dished crown is particularly advantageous when pairing with large-valve cylinder heads or aftermarket combustion chambers where traditional dome or flat-top designs create detonation risk. Installation requires careful piston-to-valve clearance verification and proper ring end-gap setup. The complete set of eight ensures uniform performance across all cylinders, making this a reliable choice for both street and competition engine builds.