His valves have 3/8" (stone-age) stems. So to save a few dollars he's going to buy bare heads and ream the valve guides out to 0.375", at least that's what I am guessing. Can you tell I think it's a bad idea? Going to extra lengths to add mass to your valvetrain seems to be going backwards, also adding a larger protrusion in the valve bowl.

RR, if this is your plan I vote for the Stealths. They are about a finished product while EVERYTHING about the Supers is unfinished IIRC.

Well I went back to the website. It looks like they may have seats and guides installed. I'd hate to have to start installing seats and guides without a proper machine shop.

The difference between 11/32 and 3/8 is only 0.03125, certainly there's enough meat in the guides for that. They're probably standard 0.502" diameter guides pressed into a 0.500" bore. Back in the day the bore in the head was the same 0.500 for either ID guide. Don't sweat it.

One last thought: Better check if the SS heads use stock length valves!

R.