SBM Dished Piston Set 4.030 Bore -16.9cc

The SBM Dished Piston Set 4.030 Bore -16.9cc is a forged small block piston assembly engineered for small block Mopar engines, specifically designed for compression optimization in high-performance and modified powerplants. This complete set of eight pistons features a 4.030-inch bore diameter with a dished crown geometry that reduces compression volume to -16.9 cubic centimeters per piston, making it ideal for applications requiring controlled compression ratios or big-displacement builds.

The piston set incorporates precision ring grooves machined to 1/16 x 1/16 x 3/16 inch specifications, which are standard for small block Mopar applications and ensure proper ring seating and gas seal integrity. The forged construction delivers superior strength and thermal stability compared to cast alternatives, critical when dealing with boost pressure, nitrous systems, or extended high-RPM operation. The dished design actively reduces peak combustion chamber pressure by lowering the static compression ratio, a proven method for preventing detonation in forced-induction or fuel-sensitive environments without sacrificing efficiency.

This piston set serves engine builders, restoration specialists, and performance enthusiasts restoring or upgrading 360 cubic-inch and related small block Mopar engines. The -16.9cc chamber volume is particularly valuable for applications combining larger displacement with premium fuel requirements or when matching a high-flow cylinder head package that would otherwise push compression beyond safe limits. Builders selecting dished pistons typically pair them with modern ignition systems and fuel mapping to maintain power while ensuring reliability across varying fuel grades.