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  1. #1
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    OMC closed deck cooling mod for 2.7 heads

    Can anyone shed some light on the procedure to do the cooling mods that need to be done to the closed deck 3 liter to install the 2.7 heads on them . I have the proper equipment to perform the mods , just need to know what needs to be done and parts to be obtained.
    Thanks in advance

    Tim
    Drive It Like You Stole It!!

  2. #2
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    No one has any input on this?
    Drive It Like You Stole It!!

  3. #3
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    I realize this is a old post but omc folks in secretive lol
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  4. #4
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    I guess since Racer help develop the closed deck cooling mod, if he wanted it posted, he would have. Besides, there's probably only a handful of people that know how to properly do it.
    Plus this is actually two different mods. First you've got to modify the heads, then you have the mods to do to the block.
    Last edited by BenKeith; 03-16-2017 at 07:03 AM.
    Keith Jones


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  6. #5
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    of he's in the business to make money I'm sure he want share it! I've just heard so many ways of doing it
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  7. #6
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    The block mod is a bit complicated and really needs to be bare when done. The head cooling is simple. I answered your PM big blue. You can run the heads without doing the block mod. Block mod evens out bottom to top temps.

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  9. #7
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    What year did closed decks start?

  10. #8
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    93 I believe wanagofast or racer knows more than me I'm a rookie
    Nitrous is like a slut. u wanna hit it but you know there will be consequences.

  11. #9
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    Actually I think 92 was the first but it did not have finger ports
    93 was the first finger ported block.
    Keith Jones


  12. #10
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    Had to have been 93. My 92 200 is an open deck, no fingerports. My 94 is a closed deck with fingerports.

  13. #11
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    1993

  14. #12
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    Sounds like it was 93
    Keith Jones


  15. #13
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    I'm running an 88 block now but have a 94 with fingerports I hope to build some day.

  16. #14
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    Oldschoolltv. If you are running that Mirage, I might have a 96 block that's almost ready to build you would be interest in. I was porting it for a bass boat, had it almost completely done and then for some reason, thought I still needed to raise the finger ports. After I had done three cylinders I realized if had F****d up and raised them .020" above the boost port. This would work great on a lighter boat, but not really that good on a 2,000 pound bass boat. I bought three more sleeves to replace them, since I don't have a need for a motor that will probably need to be turned almost 7,000 rpm. That was five years ago and it's still sitting there, needing three sleeves or the other three cylinders raised to match.
    Doctors tell me I probably won't be doing any more die grinding after having to have surgery on one and hand and probably needing it on the other so it looks like I've got a whole bunch of this stuff to get rid of. It's a complete engine so was thinking about doing the other three cylinders, building it and selling it complete. I have a set of Baker 50cc offset chamber heads and a set of rods Racer balanced for it also.
    Keith Jones


  17. #15
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    Thanks for the offer, but wife and kid take precedence over my discretionary funds right now.

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