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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
    Join Date
    Aug 2005
    Tell City, IN
    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

  4. #4
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    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

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

  5. #5
    Senior Member RACING JUNKIE
    Join Date
    May 2003
    Coldwater, MI
    I agree shouldnt make no difference.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines

  6. #6
    Junior Member JOURNEYMAN
    Join Date
    Dec 2002
    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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