This is a china magnum head, same castings regardless of who you buy them from. This particular head was just a spare "R&D" head, and the 2.02 port was a really quick seat cut, multiple angles, bowl opened up, and 15 minutes of port work. It's been a few years, but I recall it being in the 270s cfm range at .550 or close. Could have been .500 lift.
View attachment 1716302040