I am adding true dual exhaust and am wondering if I need a gasket where the heat riser valve meets the stock exhaust manifold. I have replaced the valve with a spacer and it looks like the old valve was just a metal to metal fit with the manifold. I also know the earlier year cars, up through 74, used a gasket on that side but I think the following years were a metal to metal fit. I know the underside uses a doughnut but I'm wondering about the manifold side since I am using just a spacer. Thoughts anyone?
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Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982