Camaro/Firebird LT4 Aluminum Cylinder Head, shipping is not included, sold each. This aluminum LT4 head is the same as the 1996 production head except it has the LT1 rocker stud installed. This head has light weight 2.00" intake and 1.55" exhaust valves installed in this assembly. These heads can only be used on 1992 and later LT1 and LT4 engines. Casting P/N 12555690. This head assembly includes the following items, intake valve , exhaust valve, valve spring , valve cap, seal , key , stud , and shim.