Really?? Body guy spent his morning checking this out. It is a plastic mock up block that is a touch narrower than the real thing, but with an oem style valve cover, which according to Stage V will clear there rockers, there is plenty of room. There was apparently a large variance on the production line when these cars were built. So take the fender cutting thing with a grain of salt. Only thing you can do is to verify it on your car......And Indy Cylinder Head makes a clearanced valve cover that was designed to clear the shock tower and blower motor, if you have one of the cars that the valve cover does indeed hit.....