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Thread: What size are our exhaust flanges?

  1. #1
    Aspen and Volare Junior Member
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    What size are our exhaust flanges?

    Headers were placed on my roadrunner years ago.
    Iím replacing with stock exhaust and need to know the flange size that buts up against our stock manifolds.

    Note:
    Engine is a original Supercoupe 360 with original manifolds attached.

    Built in donut is causing me to have a hard time measuring since itís not a flat surface.
    But the two holes appear to be 4in apart at centers with a rape measure.
    Also the engine is now in the car and itís not easy getting a tape measurement on it.

    I need to call the muffler shop so they can order me the correct size before I show up with the car on a trailer.

    Thanks, Lee

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    Aspen and Volare Junior Member
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    Quote Originally Posted by T-TopSuperCoupe View Post
    Headers were placed on my roadrunner years ago.
    Iím replacing with stock exhaust and need to know the flange size that buts up against our stock manifolds.

    Note:
    Engine is a original Supercoupe 360 with original manifolds attached.

    Built in donut is causing me to have a hard time measuring since itís not a flat surface.
    But the two holes appear to be 4in apart at centers with a rape measure.
    Also the engine is now in the car and itís not easy getting a tape measurement on it.

    I need to call the muffler shop so they can order me the correct size before I show up with the car on a trailer.

    Thanks, Lee
    Uh, that should say tape measure, if someone could change that for me please

  3. #3
    Aspen and Volare Super Member doublechaz's Avatar
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    I think there is an edit button on each post for the original author to use, but maybe it doesn't activate until a certain number of posts?

    Anyway, I think everyone will know what you meant...

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    Aspen and Volare Administrator Rattle Trap's Avatar
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    Pretty sure stock is 1-3/4" But if you have those flange pieces, just supply them to the muffler shop and have them adapt immediately from them close to the manifold where the gasses are hot and fast, up to 2-1/4" or 2-1/2" for a mildly build 360 to flow thru the rest of the exhaust system. Your car will love you for eliminating the restriction that robs a good 35HP from it's potential.
    Volare Magnet

  5. #5
    Aspen and Volare Junior Member
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    I plan on doing 2 1/2
    The manifolds are stock Supercoupe manifolds so I wasnít sure if there was anything special at all.
    Thanks, Lee

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