thanks travis,
4ac is 6 bolt as said, and also as said its crap because its not a fully counter-weighted or forged. I am guessing its 4af and neither one is good. It sure as hell isnt a 7A crank or block I can tell you that. I say use it up to 7000RPM or pull it apart and see whats going on. Maybe its a perfect excuse for a 7afe bottom end if thats your thing.