Harry I don't know if it can be done to a chevrolet head or not but Frenchtown Flyer used to modify Ford heads by installing a bolt through the water jacket and against the back side of the combustion chamber for extra strength. You might talk to him. He wrote a article about it several years ago in one of the magazines.
Been there, Done that, Hope to live long enough to do it again.
Big Bill
I.I.# 4698
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