GM LS FT Piston Set 4.005 Bore -3.3cc

These Race Tec Forged Flat Top Pistons (MPN: 1000603) are designed for custom-built 403 cubic inch (6.6L) GM Gen III/IV LS engines. They feature a 4.005-inch bore, 1.115-inch compression height, and a -3.3 cc flat-top crown with two valve reliefs. Made from 4032 alloy, they include CNC machined ring grooves for 1.5mm top, 1.5mm second, and 3.0mm oil rings, ensuring optimal performance for racing or high-performance street applications. Wrist pins, pin fitting, wire locks, broached pin oilers, and an accumulator groove are included. These pistons are designed to clear reluctor wheels in stroker applications and require a RaceTec AT 4005 Ring Set or equivalent (sold separately).