Does anyone have the stock dimention for the intake and exhaust guide holes as new? I know the stock size guide is .644 OD but would like to know the ID of the hole itself.
ricochet
Nowhere have I been able to find the guide hole size listed but let me ask in a different way. The manual says "tight press fit" for guides in the head. What exactly is tight press fit? I'd hate to use a .002 interference fit and crack the head itself. Manual doesn't have a spec for this specific area that I can find.
ricochet
In cast iron, .002 tight fit on a guide is perfect (up to .004 in aluminum), as long as you preheat the head & oil up the guide as you "push" it in (not hammer). Then you ream or hone to size.