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Anyone else using the MLS Cometic header gaskets? I have them on my stroker with Doug's Headers, and they are leaking all over. Never had a problem with the other kind of gaskets on my other motor with the same set of headers. Was there something I should have done? The mating surfaces were...

SO, I bought the Dougs D453 headers for my '74 Duster. The applications only list '70-'72 dusters for them, but I was told by a couple members on here that they know for sure that they will fit a '74, so I got them. I don't remember who it was that told me that, or I would PM them for help...

Is there really that big of a difference between an X-pipe and H-pipe? I know companies advertise that the X-pipe scavenges better because of the smoother cross-over, but does it really make that big of a difference?