Enlarging Transom Holes
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Enlarging Transom Holes

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    History Repeating Storz's Avatar
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    Default Enlarging Transom Holes

    Thought I would post up and pass along some info that might help others. I am in the process of installing transom exhaust back on my boat and am going with a 4" stainless tip, the original tips were the 2 7/8" trumpet style tips so I had to cut the holes in the transom in order to fit the new stuff.

    The easiest way I found was to purchase both a 3" hole saw, and a 4" hole saw. Put the 3" inside the 4" and remove the drill bit from the mounting piece. The holes in your transom are most likely 3" holes, and the 3" hole saw acts as a guide for the 4" hole saw, thus cutting a perfect hole.

    Anyone have any tricks for getting the tip aligned perfectly vertical?
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    '84 Laser LTV - Restoration in progress
    '77 Caribbean

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    Senior Member Widetrack's Avatar
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    I did the same thing on my dash to install new larger gauges! WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
    WT

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    Good tip.
    Does it sound any different (guessing better) going from the 3" trumpets to the 4" slash tips? I've thought (hard) about it, got to say I hate the trumpets.

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    History Repeating Storz's Avatar
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    I'm actually switching from OT headers back to the logs, the last time it had the logs on it I was only 14 or so, really don't remember what it sounded like. I haven't yet started it since putting the logs back on, though I have read (on here) that it does sound much better with the 4" tips, and it certainly looks better
    '84 Laser LTV - Restoration in progress
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    Finished this project up a while ago and just got around to snapping a couple pictures of it completed, I like the lower profile look of the transom exhaust. Going to switch the velocity stacks out for a dominator scoop next.


    '84 Laser LTV - Restoration in progress
    '77 Caribbean

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    Senior Member ICECREAMAN's Avatar
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    Quote Originally Posted by Storz View Post
    Finished this project up a while ago and just got around to snapping a couple pictures of it completed, I like the lower profile look of the transom exhaust. Going to switch the velocity stacks out for a dominator scoop next.


    Sweet looking boat, once you remove your flower pots, and just before you slap on that Dominator scoop, go ahead and slide a BBC in there and finish the upgrade. You'll be glad you did

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    NW Spectraholic Malcolm's Avatar
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    I did the same thing to my Spectra 18 a few years ago, but I didn't want the new pipe centered where the old one was. It would've ended up cutting into the stringer at the bottom. I just took a scrap piece of wood and screwed in on the inside of the transom (using 2 existing holes) where I knew I needed it for the centering bit. Only need one hole saw that way.

    It was a little deeper tone when I got done but not much louder at all.
    Malcolm

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    Cole SS cole ss's Avatar
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    Looks great! Did you also cut the step down off your snail/ riser and open that up also. What size hose did you use? Any pictures?

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    LIQUID QUARTER MILE Pro Mod's Avatar
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    Quote Originally Posted by ICECREAMAN View Post
    Sweet looking boat, once you remove your flower pots, and just before you slap on that Dominator scoop, go ahead and slide a BBC in there and finish the upgrade. You'll be glad you did
    HOT ROD BOATS
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  12. #10
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    Quote Originally Posted by cole ss View Post
    Looks great! Did you also cut the step down off your snail/ riser and open that up also. What size hose did you use? Any pictures?
    I'll snap some pictures of it tonight, but basically I am using a bellow adapter designed for a Mercruiser sterndrive that adapts the 3" exhaust log/hose to the 4" tip.

    Other than a dominator scoop what are some other really low profile air cleaners?

    Couple more pics


    Last edited by Storz; 10-06-2010 at 04:37 AM.
    '84 Laser LTV - Restoration in progress
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    Senior Member Widetrack's Avatar
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    Do you have a pic. of a dominator scoop? So I can see how low you want to go!


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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    small block jet 2sangers's Avatar
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    Quote Originally Posted by Widetrack View Post
    Do you have a pic. of a dominator scoop? So I can see how low you want to go!
    I talked to him and believe he is looking for a low profile Dooley scoop, like the one in my avatar.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Storz View Post
    Anyone have any tricks for getting the tip aligned perfectly vertical?
    Era, a few beers and a Sawzall work for me
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  16. #14
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    Quote Originally Posted by 2sangers View Post
    I talked to him and believe he is looking for a low profile Dooley scoop, like the one in my avatar.
    Thats the one
    '84 Laser LTV - Restoration in progress
    '77 Caribbean

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