LS Series Valve Cover Spacer Billet LS1 LS2 LS3 LS7 LSX 3/8" .375 Tall 551641-3 1999-Up GM LS Engine 3/8" Thick Includes: (2) Spacers & Hardware Will require a gasket and/or sealer on both side of the spacer Used to raise valve covers for valve train clearance