He didn't say anything about putting an LS in a Cobra. He was talking about how technology has completely bypassed flat tappet junk.
On another note, if you can that an FE has a roller cam in it by opening the hood and looking, you're a better man than me.
I, on the other hand, can tell if an engine has a flat tappet cam in it.....it's the engine that's being taken apart, completely disassembled, and cleaned, because the cam wiped down.
