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If they let bbm guys run that head then the chevy guys want to run an aftermarket head, ford guys want to run aftermarket then like you eluded to it just has to look stock and any ones definition is up for debate.

I never was a fan of the aftermarket block but they have to run a stock bore size or stock + some small over size I think...

Well, the Stage V is a factory aftermarket, cast iron head, that LOOKS factory. The best cast iron head for the Ford is the EX15, but it does NOT look factory and the next best is the factory Cobra Jet head. On the Chevy, not sure of an aftermarket iron head, better than the factory head, that LOOKS factory. And even with the Stage V, the Mopar wedges will still be WAY behind the other guys on port flow

As for bore and stroke......Factory Stock has bore limits with a stock stroke........FAST has no rules on internal parts other than a cubic inch limit, which is 560" and the Ford is 604"(which I don't get)

Monte