Both are true - oh and wasn't there someone recently who wanted to run the Boss 429 engine in top fuel drags, so the NHRA outlawed that Ford engine as well? It gets easier to compete when you just change the rules every time some one beats you.I think you got one thing wrong up there. The Bad ass engine legislated out of existence wasn't the Mopar Hemi, but the Ford SOHC 427. And only then cause Nascar didn't want to give the "Wine & Cheese" racers from Europe a foot in the door with their high tech small displacement V8's (that got their butts handed to them with a big nasty passenger car pushrod V8 at Lemans )