sm blk X and J heads

ir3333 said
How many guys have cc'd or had your builder cc your sm blk heads?
i thought most were around 70 -72...what were yours?

I have measured them anywhere from 76 to 70 and I think the 70 cc heads had been milled but the dude told me they were OE. I think he was F.O.S. but that was the only set of factory heads I have seen with identical chambers, let alone chambers that small from the factory.