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This is how I plan to install them. I'm assuming this is correct. Hope the pic's help any manifold hardware virgin's like myself. :burnout:

Thanks Trailbeast. So convex or concave facing the head?

Does anyone know where I can get a diagram of how to install the exhaust manifold hardware for the 68-70 h.p. manifolds? Don't have a factory service manual. I have a '72 duster 340 with x-heads. I am in the process of installing a set of repro h.p. manifolds with no heat shield. I'm aware...

Looking for correct part number for a set of Remflex header gaskets. Not quite sure which ones I should get. The headers I currently have are unknown to me. I have a set of '69 X-heads on a '72 340 motor. Any help would be greatly appreciated. Thanks!

Are there any differences in performance between the 70, 71 or 72 stock exhaust manifolds?

Nevermind...IIRC is 'If I recall correctly' I just looked it up. :read2: Told you I was a complete newb.

Crackedback, Thanks for the info. Yes, mymopar.com is what I was referencing. Car was built 4/72. What does IIRC stand for? Forgive me for my ignorance, complete newb.

Here are some pics.

I have the original exhaust manifolds that supposedly came of my '72 duster 340. When I bought the car, they were in the trunk. They were replaced with headers. My question concerns the casting numbers on my particular manifolds. According to the research I have done the casting numbers are...