myfirstcar66· Premium Member
Welcome to VMF ! I'm not as familiar with the 6 as I am the V8s so I will let the experts chime in, but congratulations on the car, I hope it is rust free or at least rust less. Sounds like you may have an exhaust leak under the bottom of the integral intake / exhaust. Perhaps just a gasket, maybe a crack in the cast iron, but the 6 is widely known for its durability with 7 main bearing caps and smooth-running longevity. Enjoy !