My home inspection of Speedmaster heads

John, I was referring to whatever extra shrouding you’d get from the as cast chamber after swapping out the 2.02’s for 2.08’s.
If the chambers needed reworking after the swap..... then that’s added time/$$$ being put into the heads.

I’ve only done any kind of heavy porting to a few sets of SBM RPM heads, and none with 2.08 valves....... so I don’t know if the chambers are really an issue with these heads or not.

The one set I had here for freshening that had 2.08 valves in them did have the chambers reworked(cnc from Hughes).