If it doesn't go all the way through, it'll probably be OK to use. Looks like a casting defect that should have been caught in machining. Bad QC. You could weigh each piston and see if it's close to the rest of them.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.