Three questions:
1. What is the clearance supposed to be for the camshaft "bearings"?
2. Would a head that was twisted and whose cam bores are out of alignment cause side-loading on the valves to destroy the guides? I feel like the answer to this is yes but I want someone smarter than me to confirm.
3. Does anyone know of a machine shop with the equipment to either a) align hone cam journals on these heads or b) do that AND install bearing shells?
I have a ported head here that has about 1000 miles on a new valves and guides with a fresh valve job with a whole mess of sloppy valve guides and bent exhaust valves. I know the cam bores are out of whack because the cam doesn't spin very easily when the caps are all torqued. I had a camshaft grenade in it a while ago and there are also some pretty deep gouges in the bores now too. It flows great and I'd hate to scrap it unless it's gonna cost me less to start over with a fresh head...