headers ?

Discussion in 'Technical' started by gwil81, Dec 30, 2010.

  1. gwil81

    gwil81 Member

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    I have a carb'd 91 302 and aod tranny. Will hooker 6901's work be cause the tranny is bigger.
     
  2. 302-72-mav

    302-72-mav Member

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    i dont see why not

    the exhaust flange is usually the lowest part on the car but someone will chime in that has bolth in ther car:thumbs2:
     
  3. PaulS

    PaulS Member extrordiare

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    You may have to do some shaping of the headers but you can make them fit.
    You may not find a good fit because the AOD was never used by the factory in your car.
     
  4. ratio411

    ratio411 Member

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    It has to do with the width of the tranny.
    Generally speaking, since the SBF is such a narrow engine and usually only has a narrow C4 or manual tranny behind it, the collectors are relatively close to each other. Most SBF headers won't work with a wider tranny, like a C6 swapped behind the engine. Same is most likely true for an AOD, but I don't know for sure.

    You can heat the metal of the collectors and bend them wider, but the extra heat weakens the metal. When I did it for a C6 swap, my collectors were full of cracks within a year. The proper way to do it would be to cut and reweld the headers with new primary bends at the collectors.


    Edit:
    Another way to do it:
    Get some wide header flanges and long header bolts, along with 2 sets of gaskets.
    The flanges have to be thick though. I have seen it done to clear C6 swaps.
    Put a gasket, the blank flange, another gasket, and then the header.
    IIRC, it has to be at least a 3/8" thick flange...
    This spreads the collectors apart from each other just that tiny bit needed to clear a wider tranny.

    Although, I must say that I have never seen this done on a Maverick/Comet!
    6901s have more room in just about any other engine bay, and the cars I have seen this trick done on were Stangs/Torinos.
    3/8" is probably okay in a Mav too, but I thought I'd throw that out.
     
    Last edited: Dec 31, 2010

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