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have had that happen also - all the early mopars the bolt holes went into the water jackets - from the factory they used studs instead of bolts and permetexed them in place -- i would try that if you can in fact get a 5 / 16 nut on and theirs room to tighten it - other wise empty the rad and glue them ( the hedders on ) and see what happens before you start yanking heads - jz
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