My home inspection of Speedmaster heads

All the valves had slightly different shimming under each spring, between .053 and .073.
Seals were all tight to the guides (getting replaced anyways)
Some casting flash left in 3 out of four exhaust ports on the same side (Best/worst ports pictures)
Intakes were even better, only one small spot where the head bolt goes, and only on one port.

Core shift, based on the porting work, seems to be very minimal.