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  1. #1
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    Mercury 2.5 245HP powerhead

    Mercury 2.5 powerhead. Complete drop on. I bought this as a fresh rebuild. It has never been fired. Piston tops are clean and shiny. By the markings on the block, it was most likely done .020 over. Has lightweight flywheel. Located in NJ
    $4,500.00
    Click image for larger version. 

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  2. Likes pkstv, sicknick12 liked this post
  3. #2
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    Nice & Clean

  4. #3
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    must be steel steel sleeves

  5. Likes Dave Strong liked this post
  6. #4
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    Click image for larger version. 

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    Pulled the heads. All holes appear to be steel based on the cross hatching in the cylinders. All holes are 20 over. Pistons are all Promarine based on the part numbers. Block is a clean freshwater block based on the water passages. The heads were also decked based on the hatching on them as well. Will need head gaskets unless I can track down a replacement set.

  7. #5
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    Looks like a nikasil. What do the bores measure? GLWS, these are great motors and are very strong.
    1973 Viper
    1978 Viking

  8. #6
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    Is this a big bearing or small bearing powerhead?

  9. #7
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    Quote Originally Posted by Air It Out View Post
    Is this a big bearing or small bearing powerhead?
    My guess would be small. What are guys doing for steel sleeve motors to make them work well from a cooling perspective if you are runing a 1 piece adapter plate?

  10. #8
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    Small holes out the adapter plate and keep it warm and regulate the water using poppet dump. And more clearance on the piston to cylinder.
    http://www.us1.cc/racingcoolingsystem.html
    1973 Viper
    1978 Viking

  11. Likes scott reierson liked this post
  12. #9
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    Small bearing unless it was modified for a big bearing & the crank was sleeved or changed. That has got to be a plated .020 over motor.....those sleeves do not like like cast iron liners to me...?
    I have a boat or two.... that I never get to drive

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  14. #10
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    Quote Originally Posted by rjdubiel View Post
    Small holes out the adapter plate and keep it warm and regulate the water using poppet dump. And more clearance on the piston to cylinder.
    http://www.us1.cc/racingcoolingsystem.html
    You mean by running a larger ring gap?

  15. #11
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    Ring gap is based of bore size. All depends on Pistons too. Forged Pistons need to add .003 to the piston to cylinder clearance. The piston will heat and swell faster than the steel sleeve so need the extra clearance to not scuff
    1973 Viper
    1978 Viking

  16. #12
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    Low rpm this info is not needed. 7 to 8k plus do some reading for steel bore with forged Pistons
    Click image for larger version. 

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    1973 Viper
    1978 Viking

  17. #13
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    Back to this for sale post. Has the seller replied to anyone?
    1973 Viper
    1978 Viking

  18. #14
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    I replied to all my PM's.
    Like I said in the first and second post, I did not build the motor nor have someone build it for me. I bought it just as you see it, so I am not sure on the specs as to the bearing size. all 6 sleeves are steel.

  19. #15
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    Interested, how long would you be willing to hold it if you got a down payment? I live in Cali and have family in NJ...not sure when I would make it out that way next.

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