SBM Flat Top Piston Set 4.080 Bore -6cc

The KB Performance Pistons SBM Flat Top Piston Set 4.080 Bore -6cc is a hypereutectic piston kit engineered for small block Mopar engines requiring precision bore sizing and specific compression geometry. This eight-piston set delivers the exact displacement reduction and ring groove configuration needed for modified street and performance applications where OEM pistons no longer meet the builder's specifications.

Each piston features a 4.080-inch bore diameter with a -6.00 cubic centimeter compression cavity and carefully sized ring grooves (5/64 x 5/64 x 3/16 inches) that maintain proper ring seal and oil control across varying RPM ranges. The hypereutectic construction provides superior heat transfer and dimensional stability compared to cast aluminum alternatives, critical for engines operating at elevated boost pressures or extended high-load duty cycles. The flat top profile prevents piston-to-valve contact in tight deck clearance builds and supports aggressive cam timing without compromise.

This piston set addresses the needs of engine builders and performance technicians rebuilding small block Mopar platforms where factory bore diameter or compression specifications no longer align with the intended power target. Whether restoring a vintage drag racing engine, upgrading a street performance application, or freshening a marine or industrial small block, the KB 243.040 offers the dimensional precision and proven durability required for reliable long-term service.

KB Performance Pistons maintains strict tolerances and material standards across its hypereutectic product line, making this set a direct replacement choice for builders who have already proven the brand's fitment and performance characteristics in small block Mopar platforms. Complete your engine rebuild with matched quality components designed to withstand the demands of performance driving and extended service intervals.