hairline crack in block....help!

Posted by custo eight On 2016/10/13 9:45:05

I have the 356 engine torn down for total rebuild. The shop had bored the cylinders 030 over, installed valve liners and in the process of grinding the valve seats found a hairline fracture stretching from #8 valve seat to cylinder wall adjacent. What are the options? (if any). I don't mind traveling to qualified shop if it is only a few states away from SC. Picture below shows the crack from about "11 o clock" on the valve seat to "3 o clock on the cylinder perimeter. Somehow (in my limited understanding)I can't picture this as freeze damage. Wonder if it is a casting flaw from the original manufacture. Maybe the water jacket does pass thru this area but seems awfully tight for a passage.

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