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Im aware of the factory procedures. We have the complete set offactory manuals.
Years ago I was having my heads refurbed by one of the famous west coast machine shops, I asked them about oversized guides. They told my that usually they arent required unless the head has been damaged by bending/breaking valves, or damaged by poor removal techniques.
Chances are if you drill out the guide, and carefully remove it, you will find that you still have the 0.06-0.08 mm interference fit with regular guides per the manual..
Its convenient to measure furst, rather than spending time turning oversized guides down on a lathe. Chances are the normal sized guide will fit. BTDT
Pro machinists have lots of time saving tricks, and sometimes they share them, all you have to do is ask.
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'69 911 GT-5
'75 914 GT-3
and others
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