What to do about head dowels when drilling out 9mm holes?

RowdyN54

New Member
Jan 9, 2025
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Hey all, dropped my motor at the machine shop the other day but he asked me what I want to do about about the dowels when we Drill out the 9mm holes for the arp 11mm kit.

I'm not sure because I've heard about blocks cracking there after drilling out so I'd be worried to take more material to replace the dowels with larger. Maybe I can move them in one bolt set closer and remove material from there? Would love some educated opinions before I have him cut up my block, appreciate any help!