For use in 1997 and later Corvettes and 1998 and later Camaros/Firebirds. This camshaft is comparable to the LT-4 HOT camshaft, but is for the LS1/LS6 engines. It features .525" intake and exhaust lift with 219 degrees intake duration and 228 degrees exhaust duration @ .050" on a 112 degree centerline. Includes 16 LS6 valve springs. Pictured shims are for use with early style LS heads, and will not need used on applications where valve seal features a built in seat. Installation requires reuse of stock spring retainers.