Bullet Pistons GM LS dished piston set for LS-Series engines. Features a 4.030in bore, 1.5 x 1.5 x 3mm ring grooves, and -13.00cc volume, forged from 2618 aluminum alloy for strength and durability. Includes 8 pistons, chromoly wrist pins, wire lock rings, and a ring set with gas-nitrated steel top rings, Napier 2nd rings, and soft nitride oil rings. Compression height 1.110in, designed for LS1/LS2/LS3 engines with 4.000in stroke in street-strip or drag racing, offering improved horsepower and reduced friction with forged side relief and contact reduction grooves. Sold as a kit.