This tool kit Fits For cathedral port LS cylinder heads. Like: LS1, LS6, LS2, LQ4, LQ9, 5.3L, 5.7L, 6.0L, and all the other LS cathedral port variations.Universal for LS Engine! (For Example: It will work on any LS engine for Firebird, for Silverado, for Camaro, for GTO, forTrans am, for Corvette, for CTSV, for Sierra, for Tahoe, for Suburban, for Pontiac G8 GT and more. ).