this is on the out side edge of the bottom of #4 bore on a 400 block. I can stick a paper clip into it to about where the line is at. I have taken the drain plug out of the side of the block and shined a bright flash into it ,I don't think it goes thru but can it cause problems in the future?

Is there a fix ? is this common ?

6852680-BORE.jpg (154 downloads)

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