GN1 heads valve to guide clearance

[slimtastic]

anybody know whats accebtable for the valve guide clearance on aluminum heads? namely the exhaust guide to valve stem clearance?

 

[750H.P.V6]

I'm not sure what Champion uses but I wouldn't go tighter than .002" on the exhaust myself. I'd prefer to be between .002" and .0025"

Neal