I've heard of patching a block like this but have never seen it done an old time machineist told me that's how they used to fix blocks that were still solid but had a piece knocked out,Now I'm talking "Old Timer" here as in older than dirt pre model T ford kinds of guy!
I've repaired several engines and if properly done there is no reason that you should worry about a "patched" block remember there was a time when welding/brazing was an exotic fix!there was block "stitching" and bolt on patches back then.I stitched a cracked water jacket 18 inches long on a Cummims Diesel over 2 years ago for a friend and it's still running strong and hasn't leaked a drop!Never needed to pull the engine did the repair in about 4 hours in the truck.
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