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Thread: Exhaust order for 7/4 swap cam

  1. #1

    Exhaust order for 7/4 swap cam

    I'm running a 7/4 swap cam does anyone know FOR SURE the order in which the exhaust pipes should be paired. I think it's 1 3 5 7 , 2 6 4 8. Please let me know if this is right or wrong. I already have my headers made from lemons but I will change them if I have too. Thanks for looking.

  2. #2
    Senior Member EXPERT BUILDER
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    Aug 2005
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    I guess I am not sure what you are asking...How are you going to pair exhaust pipe 2 and 6 (or 4 and 8) Do you mean at the collector? :?:

  3. #3
    Yeap

  4. #4
    Senior Member RACING JUNKIE jmarksdragster's Avatar
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    I can't see any difference for the exhaust unless you were building 180 degree headers, not likely, or 4-2-1 headers. I run the same ones on my dragster, 4 to 1, with the 4/7 as I did with the standard cams.
    Mark Whitener
    http://racingfuelsystems.myfunforum.org
    __________

    Good work isn't cheap, and cheap work can't be good.

  5. #5
    Senior Member RACING JUNKIE
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    I agree shouldnt make no difference.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  6. #6
    Junior Member JOURNEYMAN
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    kNOXVILLE,TN.
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    Only makes a difference if using tri-y headers and then they are different for the 4-7 firing order swap

  7. #7
    My header is a 4 to 2 to 1


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