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  1. #1
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    What motor is this? 2.0 or 2.4?

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  2. #2
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    Look at the silver round Welch plug on top of block between the flywheel and the exhaust plate. Your serial number should be there. Or yank a head and measure the bore
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  3. #3
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    Quote Originally Posted by rgsauger View Post
    Look at the silver round Welch plug on top of block between the flywheel and the exhaust plate. Your serial number should be there. Or yank a head and measure the bore
    The numbers on the W plug and the clamp are the same, which come up as a 86 175.. but doesnt say anything about displacement.. and from what i understand the 2.4 had 3.5 inch bores, and the 2.0 had 3.115 bores, this 3.375 is whats throwing me off on the heads.

    Btw, the serial is 0B220637, where can i find the displacement? Or is a year thing?

  4. #4
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    3.5" = 2.5 liter. Those are 2.4 liter heads

  5. #5
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    What carbs are on it?

  6. #6
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    175 those years are gonna be a chrome bore block (2.4.. 3 3/8").... basically a 200 block half with vertical front.

  7. Thanks SkywayGT thanked for this post
    Likes bullet123, FAST RALLY SPORT, SkywayGT liked this post
  8. #7
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    Its a 2.4. Yes tommy is right. I have a 1984 chrome bore 200. same as that motor with horizontal front.

  9. #8
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    Huh. I have two factory 1988 175s that are 2.0s
    I also had two 200s from 1986 that were 2.4s...but not the 175s.

  10. #9
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    i know that tha '87 up (pretty sure tha '86 was to) was a chrome bore.. tha 2.0 heads will have 3 1/8 in tha circle...

    BUT its mERC SOOO!.............
    Last edited by tlwjkw; 06-11-2021 at 10:39 AM.

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  12. #10
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    Quote Originally Posted by tlwjkw View Post
    i know that tha '87 up (pretty sure tha '86 was to) was a chrome bore.. tha 2.0 heads will have 3 1/8 in tha circle...

    BUT its mERC SOOO!.............
    Oh shoot, you right. I messed up. Yeah the 2.0 say 3 1/8. Too many eighths...Thats odd that the 1986 was a 2.4 and then in 1988 they dropped back down to the 2.0. I wonder why.

  13. #11
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    don't know??? every 175 i've seen/had (not many, think 3) since '86 were 200 block halves.... that was tha only reason i had 'em, spare 200's.. add horizontal, 20's/22's, 46's and wal la, 200.

    shoulda added that most tha 175's run as good are almost as good as tha 200 depending on what ya set it up for.....
    Last edited by tlwjkw; 06-11-2021 at 11:36 AM.

  14. #12
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    Weird. I'll take pics of my 2.0 175s whenever I go back by the shop.
    Last edited by 25two.stroke; 06-11-2021 at 10:57 AM. Reason: I guess we will never know with mercury

  15. #13
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    check tha build dates while ya there....

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  17. #14
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    Quote Originally Posted by tlwjkw View Post
    check tha build dates while ya there....
    I know when you run the serials they don't come up in mercnet/EZ Parts Catalogue. I wouldn't doubt if it was a Mariner only thing or something...they had extra 2.0 blocks and just sold them on the Mariner line? Who knows.
    I do know the pair of 175 2.0s I have right now are twins that were rigged on this boat new in 1989 and then came off three years or so ago when we rigged twin 150 fourstrokes on this boat. Bone stock motors with 2000+ hours on them, never rebuilt. He traded them in and I ran one for two years and the other has just sat.

  18. #15
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    try this site

    Mercury Parts Catalog (brunswick.com)

    Mercury Parts Catalog (brunswick.com)

    thats as for as i can get on that site.. my pin got canceled several years ago...
    Last edited by tlwjkw; 06-11-2021 at 11:13 AM.

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