It's a ft engine. It was just a blow up diagram from a parts manual I found online. Cafepress was pretty easy to use in a drag/drop way to design a t shirt on the fly.
Either way, it's a neat shirt.
Who knows, maybe it wasn't mine and someone else did exactly the same thing I did
Weirder things have happened.
Sure woulda been cooler with a 427, but who cares, right?