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The carb does have the cast iron base. I have had the carb off before but don't believe it had an insulator along with the gasket but that is sure something to think about. Anybody know of a place I could get one? Thinking probably napa and ask them to look for one for maybe a C60 327 with two barrel. Also it did not used to have this issue, quite possibly until after i had carb off so maybe operator error!