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  1. #1
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    2.7 Heads on 3.0 I know, dead horse

    Ok, so I have browsed through the posts on here but most are pretty old...was wanting to get some fresh feedback on the idea of 1986 2.7 200XP Evinrude heads on a 1989 225 plain old Evinrude.. First of all, can I just take the heads off the 1986 2.7 and slap them on the 1989 225 with no mods or anything done to them? Then, if those fit what kind of performance expectations should I have? What changes? I have seen people say they get 120 PSI from about 90 on this swap... The 225 is in decent shape, probably going to need main and rod bearings but will last a few months til the end of this season.. I would love to get more top end... Its on a 1986 Baja 200 Sunsport.. I usually get 93 octane.. Boat only gets to about 53 MPH..was expecting more... 21 inch prop... Need to hook up new tach still, Not sure what RPMs are... Please, let me know all you can about this idea...put links to other threads, comment, or just tell me to forget it!! Thanks!

  2. #2
    Join Date
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    NY
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    Are you running the airbox?
    With the heads you will need to rejet up a couple sizes.
    Can also use the thinner gaskets since you will need gaskets anyway(93 and newer) for 5lbs comp(does vary) but i got 4-5 on my motors(my old motors not my current ones these were milled and need the thicker gaskets)....
    Your not going to do any other mods correct?

    Do you have or have access to a set of heads or???
    Last edited by mrichartz; 08-14-2019 at 02:41 PM.
    '84 Checkmate Convincor
    Twin v6 closed deck Evinrude loopers
    Heavily ported,2.7 heads,cooling mods
    milled finger ported to match vertex pistons,
    All casting slag removed
    Sleeves in opposite so no idle reliefs
    drilled/relieved exh, lower and mid,
    148 psi comp,balanced pistons and rods, Holley red,Stuffed,77d jets 106 pullovers
    CDI 8500 digital ignitions ..Boyesen reeds..And more....

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