Bad head for my 512 stroker

Those “79.5c “ and “81.5” cc numbers look like what you’d see in an NHRA tech bulletin........ which are usually way different than reality when it comes to BB mopars.

The virgin open chamber Mopar heads I’ve measured that still had the OE valves were in the 88-91cc range.

It takes a fair amount of milling to get one in that 79-81cc range.

Could there be some oddball thing out there with noticeably smaller chambers?
Sure...... never say never........ but 88-90 is what you’re going to get from just about any untouched open chamber BB Mopar head with the OE valves you come across.