SBC 604 Crate Piston Set 4.030 Bore

The MAHLE PISTONS SBC 604 Crate Piston Set 4.030 Bore delivers forged precision engineering for small block Chevy builds requiring reliable high-performance internals. This complete set of eight flat-top pistons is engineered to handle demanding engine applications where durability and consistent bore fit are critical. The 4.030-inch bore specification accommodates overbored or performance-built blocks, making this piston set a core component for engine builders and enthusiasts undertaking serious displacement or compression upgrades.

Each piston features a flat-top design with precisely sized ring grooves—2.0 x 1.5 x 4.0 mm—optimized for small block Chevy ring packages and combustion chamber geometry. The minus 4.90 cubic centimeter dish volume is calculated to work within specific compression ratios and head configurations common to SBC 604 builds, ensuring proper quench distance and detonation resistance. Forged construction provides the strength necessary for sustained high-RPM operation and boost applications, while maintaining tight tolerances essential for cylinder wall sealing and piston ring performance.

This piston set is engineered for engine builders, performance shops, and serious small block Chevy enthusiasts assembling stroker motors, racing engines, or high-compression street builds. A complete set of eight ensures you have matched pistons for all cylinders, eliminating the need for multiple orders. The 13.35-pound weight reflects the density and mass of quality forged aluminum, confirming MAHLE's manufacturing standards. Whether you're building a 406, 427, or other large-displacement SBC variant, these pistons provide the precision foundation required for reliable long-term operation.