LSX FT Piston Set 4.125 Bore -4.8cc 12-Degree

The LSX FT Piston Set 4.125 Bore -4.8cc 12-Degree is purpose-built for high-performance marine and performance automotive applications where reliability and precision fuel combustion matter. Whether you're pushing a boat engine to its limits or upgrading a street performance build, this piston set delivers the compression and geometry needed for consistent power delivery and durability under sustained load. Anglers and boaters who demand reliability from their powerplants understand that quality internals are the foundation of trouble-free operation on the water.

This eight-piece piston set features a 4.125-inch bore diameter matched to a -4.8 cubic centimeter dome chamber with a 12-degree valve relief angle, engineering specifications that optimize combustion efficiency and reduce detonation risk under high-load conditions. The negative dome design lowers overall compression ratio while the 12-degree valve relief geometry ensures proper valve-to-piston clearance during overlap events, critical for preventing catastrophic contact on high-rpm applications. Precision-forged construction and tight manufacturing tolerances ensure consistent ring seal and minimal blow-by, protecting your oil and extending engine service intervals—essential when you're far from the nearest service dock.

This piston set is ideal for LSX-platform engine builds targeting 5,500 to 7,000 rpm continuous operation, common in marine and performance applications where sustained power matters more than peak numbers. Installation requires professional machine work and proper ring gap preparation; confirm your block clearance and connecting rod length before ordering. The complete set arrives ready for honing verification, and proper break-in protocol will ensure maximum ring seating and engine longevity.