SBC Dished Piston Set 4.030 Bore - 18.9cc

The Race Tec Pistons SBC Dished Piston Set 4.030 Bore with -18.9cc displacement is a forged piston assembly purpose-built for small-block Chevy engine builders seeking reliable, high-performance ring control and combustion chamber optimization. This eight-piece set incorporates dished piston geometry to precisely manage compression ratio and flame-front characteristics in naturally aspirated and forced-induction small-block applications.

Each piston features 1.5 x 1.5 x 3.0 mm ring grooves engineered to maintain consistent ring seal and minimize blow-by across a wide RPM range. The -18.9cc dish volume reduces combustion chamber turbulence and improves fuel atomization, a critical design consideration for builders targeting higher compression ratios or running boost-sensitive ignition timing curves. Forged construction delivers superior strength and thermal stability compared to cast alternatives, essential for sustained high-output operation and thermal cycling durability in competition or street performance environments.

This piston set serves small-block Chevy engines across 350, 383, and stroker configurations where precise bore sizing and combustion chamber geometry are non-negotiable. Buyers assembling race engines, street performance builds, or high-compression naturally aspirated platforms rely on Race Tec's forged piston quality for consistent bore fit and ring groove integrity under sustained load. The 4.030 bore diameter matches modern small-block blocks and late-model regenerated cores, making this set compatible with modern machine shop standards and overbore specifications.

Small-block Chevy piston selection demands attention to compression ratio, ring groove design, and thermal management. The -18.9cc dish geometry paired with the 1.5mm top ring groove creates the combustion environment required for controlled detonation and efficient flame propagation. Engine builders integrating this set must verify crankshaft stroke, connecting rod length, and deck height to confirm final assembled compression ratio and piston-to-valve clearance before installation.

Set of 8 forged pistons. Verify bearing clearances and piston pin fit with your machine shop before assembly. Race Tec specifications are engineered for precision OEM-style builds and aftermarket race platforms.