which is unfortunately a chevy. Before all the Chevy lovers chime in to speak of chevy superiority you might wanna stop before you even start. Seeing as how the main differences in this motor are the heads which are a set of Sonny Leonard pieces that flow retarded amounts of air, and the bore spacing up from 4.650 to 5.0. The old heads lynch ran were actually ford 460C's which arent even the best you can get for a ford, but due to the limited available heads that would support what they wanted to do they made the switch. There is no off the shelf Chevy head that has ran the kind of times that lynch has, and since his competitors have switched to more exotic combo's he did so as well.