The head pipe to manifold gaskets are typical Fel-Pro...but like I said...I am running a SPACER to get the damn pipe off the underbody....I took the spacer and RTV'd the two gaskets to it when I installed this engine last summer.
I had those same gaskets on my 440-6 mine made the same noise or close to it. I had to tighten them up over and over. Then someone said to run my manifolds without gaskets, that they came that way from the factory.
I wasn't sure if that was true or not, but I pulled mine off and went without gaskets on the pass side. No more noise.
Yr one has a seperate part number for the 440-6 head pipes. Mine went on without any problems. They cost like 106 each.
In 70 there is a different part number for one of the manifolds. I got mine off of a 70 challenger six pack. The flange had a different twist to it rather than the b body 69 stuff.
