News:
Big blocks use a stamped steel valley pan under the intake. One set of gaskets goes between the valley pan and the heads, and the other set of gaskets goes between the valley pan and the intake... That make sense? I always left the gaskets between the valley pan and heads out and used gasket sealer in a tube there. I think it creates a better seal to keep down vacuum leaks and oil seapage...
BTW the factory didn`t use either gasket just the pan & some sealer