Dave, are you confident that the heat didn't damage the valve springs, rings or any other internal engine parts? Valve springs would be my biggest concern. I slung the belt off of the water pump on a 454 many years ago and didn't know that the engine was running hot. When I realized it was hot I shut it off, but the damage was done. The valve spring had to be replaced because the heat made them weak.
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Freddie
1969 Camaro RS/SS396 (427) 4 speed
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