SBC Dished Piston Set 4.030 Bore -12.3cc

The RACE TEC PISTONS SBC Dished Piston Set 4.030 Bore -12.3cc is a premium forged piston solution engineered for Small Block Chevy high-performance engine builds. This set of eight forged pistons delivers the compression-reducing geometry and durability required for forced-induction, nitrous oxide, and high-boost applications where controlled detonation and reliability are non-negotiable. The dished crown design lowers the compression ratio, creating a safer combustion chamber geometry that resists pre-ignition and knock—critical performance factors for engines running aggressive fuel and timing combinations.

Manufactured to exacting forging standards, these pistons feature a 4.030-inch bore size compatible with overbored Small Block Chevy applications and 0.040-inch oversized crankshaft journals. The -12.3cc dish geometry reduces static compression ratio significantly, allowing tuners to run boost pressure or nitrous systems without risking engine damage from detonation. The 1.5 x 1.5 x 3.0mm ring grooves accommodate modern piston ring packages, while the coated skirt reduces friction and scuffing during break-in and under sustained high-RPM operation. Each piston in the set weighs 11.7 lbs total, indicating precision manufacturing with minimal variance between units—critical for engine balance and smooth operation at elevated RPM.

This piston set is designed for Small Block Chevy engine builders and performance enthusiasts preparing boosted or nitrous-assisted engines where standard flat-top and domed piston designs create excessive compression and detonation risk. Street/strip builders, drag racing programs, and forced-induction platform developers rely on dished pistons to achieve safe, repeatable performance at elevated boost levels. These pistons are ideal for engines targeting 8:1 to 9:1 static compression ratios on pump gasoline with aggressive timing curves, or for naturally aspirated combinations requiring lower compression to accommodate large camshaft overlap and residual heat from headers and intake design.