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  1. #1
    Join Date
    Sep 2012
    Location
    brown city Michigan
    Posts
    160

    Default another cam question

    My friend is lookin at a 4/7 swap. Do many people use these and is there any advantages of using these cam's

  2. #2
    Join Date
    Nov 2007
    Posts
    509

    Default

    I use them in my l/m motors.I've never dynod them back to back but I wouldn't expect more than single digit hp numbers if that.They load the crank different and are suppose to be easier on the bottom end.

  3. #3
    Join Date
    Sep 2007
    Posts
    208

    Default

    clears up rod interference on num. 7

  4. #4
    Join Date
    Sep 2012
    Location
    brown city Michigan
    Posts
    160

    Default

    Quote Originally Posted by dave41 View Post
    clears up rod interference on num. 7
    And what's that mean?

  5. #5
    Join Date
    Sep 2007
    Posts
    208

    Default

    build a longer stroke engine , you will rod to cam interference.

  6. #6
    Join Date
    Feb 2015
    Posts
    896

    Default

    The 4-7 swap, although relatively new to racing, is nothing new for GM engines. It's simply the firing order for the old Oldsmobile engine introduced as a 303 c.i. in 1949 and like RCJ said it's doubtful that you'll see much, if any, difference in horsepower. I'd direct my efforts to something more substantial.

  7. #7
    Join Date
    Jun 2007
    Posts
    1,047

    Default

    Some people feel like they are a little bit "smoother" on the track. Take that for what it's worth since on-track feedback can be subjective to other variables.

  8. #8
    Join Date
    Oct 2016
    Posts
    12

    Default

    Quote Originally Posted by 95rayburn View Post
    My friend is lookin at a 4/7 swap. Do many people use these and is there any advantages of using these cam's
    Keep in mind that u should use headers designed for the altered firing order if u wish to obtain maximum benefit from the 4/7 swap cam.

  9. #9
    Join Date
    May 2007
    Posts
    3,435

    Default

    Only true if you use tri-y headers.

  10. #10
    Join Date
    Oct 2016
    Posts
    12

    Default

    Quote Originally Posted by perfconn View Post
    Only true if you use tri-y headers.
    My bad, I should have clarified. Thanks for correcting me.

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