The big Pontiacs all had Chev engines into the early seventies. My friend's father's '75 Bonneville had a 455. Neither fact has any impact on the Firebird myth in my eyes.
The myth that I reacted to recently was that Pontiac muscle cars sold in Canada were available from the factory with Chev engines. The only two Pontiacs that I consider muscle cars are the Firebird and the GTO. If you want to get picky, you could say that the Firebird is a ponycar, and therefore isn't part of the myth. I think we've concluded that no factory GTO ever came without a Pontiac engine under the hood, so technically the myth is busted. But since the root of the myth was the need to slip a Firebird into the Trans Am series by using a Chev engine and was accomplished by inventing a loophole, the only info that is important is proving that a first gen Firebird came from the factory with a Chev engine - or that no FGF ever did. I know I'm probably one of the few that is bugged by the myth - but that's me!
I remember specifically the attempt at a class action suit when Cadillacs in the late seventies received the corporate (Chev) engines instead of a Cadillac engine. Were they justifed?
