− Decrease quantity for Pistons, Professional Series Piston Kits, 4.005 in. Bore, Forged, Flat Top, 1.2mm, 1.2mm, 3.0mm Rings, Chevrolet, 6.0L LS, Kit Quantity + Increase quantity for Pistons, Professional Series Piston Kits, 4.005 in. Bore, Forged, Flat Top, 1.2mm, 1.2mm, 3.0mm Rings, Chevrolet, 6.0L LS, Kit Add to cart