speedmaster 440 heads
There was a period of time, early on, with these heads (PC/SM Victor copy) when the assembled version were supplied with valves that were just wrong.
Way too long, and 2.25/1.88 diameter.
The “correct” length valves are the same as the Ede Victor and Indy 440-1 heads.
Starting with the unported version, a decent valve job and some mild clean up work and they’ll get to 320 pretty easily.
Some Pro Comp "Victor" stuff.....
Pro Comp BB Victor CNC heads