This listing is for (8) Sealed Power Pistons and matching Hastings Moly Ring Set compatible replacements for Chevrolet 350 Vortec 5.7 1996-2002. This kit is for a 4.00" std Bore Engine. Speed Pro Pistons Dish with 4 valve relief. These pistons can be free floated but LR63 locks not included & must be purchased separately.