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  1. #1
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    1999 Mercury 300 Promax Powerhead

    I have a real clean 1999 300 Promax for sale. This is a 100% bolt on and go powerhead. Has 140psi compression cold on all 6 holes, its healthy. Oil injection has been removed. No holes no welds never been hurt. 3700 Price is pretty firm but I'm open to offers. I can ship or help with delivery. Shipping is on your dime, or I will cover us meeting up somewhere in FL. I don't receive PM messages on here very reliably so please either post on here or text me 941-465-6300


    STV River Rocket 9.9 Tiller motor
    1981 21' Superboat 300 Promax
    1974 Aquasport 222 250hp Merc
    1987 21' Douglas Skater.....Likely still in the paint shop.....
    1996 STV Euro 2.5 260 efi on a Custom aluminum Strongback Trailer.SOLD!

  2. #2
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    Saskatoon, Saskatchewan
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    I can see that this powerhead is dressed. What serial number range is it. I may have a mid for it I just want to make sure

  3. #3
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    Quote Originally Posted by theonlysteve View Post
    I can see that this powerhead is dressed. What serial number range is it. I may have a mid for it I just want to make sure
    Theonlysteve this is a3.0L mercury. If you have a 3.0L mid section then it will fit.
    STV River Rocket 9.9 Tiller motor
    1981 21' Superboat 300 Promax
    1974 Aquasport 222 250hp Merc
    1987 21' Douglas Skater.....Likely still in the paint shop.....
    1996 STV Euro 2.5 260 efi on a Custom aluminum Strongback Trailer.SOLD!

  4. #4
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    PRICE DROP 3200 BUYS IT> Buyer pays shipping
    STV River Rocket 9.9 Tiller motor
    1981 21' Superboat 300 Promax
    1974 Aquasport 222 250hp Merc
    1987 21' Douglas Skater.....Likely still in the paint shop.....
    1996 STV Euro 2.5 260 efi on a Custom aluminum Strongback Trailer.SOLD!

  5. #5
    Join Date
    Jul 2010
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    Bradenton florida
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    677
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    Sold, thanks SnF!!
    STV River Rocket 9.9 Tiller motor
    1981 21' Superboat 300 Promax
    1974 Aquasport 222 250hp Merc
    1987 21' Douglas Skater.....Likely still in the paint shop.....
    1996 STV Euro 2.5 260 efi on a Custom aluminum Strongback Trailer.SOLD!

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Chris Carson's Marine