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i don't have the heads off so can't do the fingernail test, but it doesn't look like what comes up when i google bore score. good compression squares with that. just trying to understand if what i'm seeing is just harmless "patina," or some sort of damage that i should be worried about.
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Current '20 AG X7M50 (daily + track tow), M4 GTS (track), '21 X3 M40i (wife)
Recent Past '11 E90 M3 (track), '21 DG X5MC, '22 BG G82, '12 E92 M3 ZCP, '08 E93 M3, '18 F80 ZCP, '04 E46 M3
Cleaning out my garage -- stuff for sale
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