Indy/RHS Heads

fishy,
Keep in mind that the 11/32 stem valves from Ferrea are 5/16 behind the head of the valve, this is only about .006 different from the 8mm stems. So it may not hurt it as much as you think, but I agree that it may hurt it some but I'll wait and see what happends when I get the guides opened up. I have some of those valves here just for that purpose of testing. I'll know this week. After I get the guides opened up I'm going to narrow and radius the guide and see just how much more air flow I can get.