Wow this thread did not go the way Mark expected for sure. There are fast LT1's and Fast LS1's. Both have pros and cons which both Will and Alex know. My vert only has LT's, 373's, Intake, and a good tune and I have beaten LS1's that had intakes and LT's. Is my car just a freak or has it been set up right. If you use your head both can do just fine. If not your just wasting money either way you go. GL Mark.