Bikebro,
looking closely at the photo it looks like the metal is very thin .
Pls advise the thickness .
In the past I have seen cover plates bolted on the side of blocks to cover cracks
or holes but have had no personal experience with this type of repair .
My guess is that the engine would need removal and block stripped and chemically cleaned as a start . Then taken to a competent repairer for advice .
I can not recommed anyone to do the repair as I'm located in Sydney/Australia.
Spencer Lane Jones might advise you after looking at the photo.
Good Luck
Geoff
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