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    Results 1 to 8 of 8
    1. #1
      Join Date
      Jul 2002
      Location
      Mesquite, TX
      Posts
      4,901
      Country Flag: United States

      How much dimple is too much?

      1 5/8" primary headers on an LS1.

      It looks like if I dimple both front pipes for frame clearance about 1/4" it'll cure all my (header routing) woes and I won't have to make nearly as many other changes to the headers.

      Will this completely ruin performance? It looks like cutting and rewelding the flanges will just create other issues - I'm awful close to the starter as it sits, and I'd end up closer, etc.

    2. #2
      Join Date
      Aug 2008
      Location
      jacksonville,fl
      Posts
      970
      Country Flag: United States
      I always here the term dent or dimple header for clearance which would mean concaving the pipe in , which would create some restriction. However if you more skillfully oval or d-shape the pipe, then you retain the same exact internal volume. Make sense? If you hold a block of wood, flat metal plate, etc over pipe & hammer it, you can more oval the pipe rather than dent it. Grab a cheap 1 5/8"pipe extension from auto store to practice on if needed.
      In general, dents don't always really lower performance, mostly because many engine have larger than really needed headers. In your case, yours are not bigger than needed,so should be more carefully handled.

    3. #3
      Join Date
      Jul 2002
      Location
      Mesquite, TX
      Posts
      4,901
      Country Flag: United States
      That makes sense, thank you. The practice piece is a great idea.

    4. #4
      Join Date
      Nov 2006
      Location
      Mountain Springs, Texas
      Posts
      4,487
      Country Flag: United States
      https://www.dailymotion.com/video/x3vupq0

      Don

      1969 Camaro - LSA 6L90E AME sub/IRS
      1957 Buick Estate Wagon
      1959 El Camino - Ironworks frame
      1956 Cameo - full C5 suspension/drivetrain
      1959 Apache Fleetside


    5. #5
      Join Date
      Jul 2002
      Location
      Mesquite, TX
      Posts
      4,901
      Country Flag: United States
      Thank you very much, Don, I feel a LOT better now.

      Hell, I'm only dimpling two tubes, I may gain horsepower!

    6. #6
      Join Date
      Nov 2009
      Location
      Peoria, Az
      Posts
      66
      Country Flag: United States

    7. #7
      Join Date
      Jul 2002
      Location
      Mesquite, TX
      Posts
      4,901
      Country Flag: United States
      I think that's the same video Don posted (just on a different site). I don't have a subscription so I can't watch to verify.

    8. #8
      Join Date
      Nov 2009
      Location
      Peoria, Az
      Posts
      66
      Country Flag: United States
      I think you're right. Sign up for the 14 day trial. There are a ton of good shows on there.





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