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Thread: I need some help with some measurements. . .

  1. #1
    Senior Member
    Join Date
    Mar 2010
    Got a customer going to give ma a captians call system for my boat but he says I need to measure the risers. .. problem is the boat is 4hrs away in storage. This is a 97 carbed 454/300HP with the standard Merc, manifolds on it going to the exhaust U pipe for through hub exhaust.
    How high are the risers?
    What diameter is the pipe?
    Thanks for the help.

  2. #2
    I think most all new risers are 4 inch. I dont think I have ever seen a 3" on a big block. If you need the height of a stock one I have one laying in the attic.

  3. #3
    I bet Rexone (Mike @ Rex Marine) will have all of that info right at his finger tips.

  4. #4
    Senior Member
    Join Date
    Mar 2010
    thanks dave, I will PM him.

  5. #5
    If you are currently going through the hub wont you need to change the riser to put a captains call system on anyway?

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