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  1. #1
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    Question Converting a mercury 225x/250 efi to 300x

    Hey guys, is it possible to convert a 225x or 250 efi down draft intake to a 300x or get it close to it.
    1) Would heads*c16*
    reeds*chris carson c.fiber*
    and computer *simmon motor sports remap* upgreads do the trick?
    2) Aren't the port and stroke the same on both block? What else can be done to make this work.
    Thinking about sending tge block to black magic racing to be worked on but for now will these simple upgreads get me more power?

    Let know what you guys think. Buying a 300x is easier but im looking a expand my knowledge

  2. #2
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    225x motor is a 2.5L motor 300c is a 3.0L completely different motor

  3. #3
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    Quote Originally Posted by R.grover View Post
    225x motor is a 2.5L motor 300c is a 3.0L completely different motor
    Im talking about the 03 225 efi 3.0l The x behind the 225 is the length of the mid just like they would have xl meaning 25 inches. There all 3.0l im asking about. . Srry for the confusion

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    Swt az then thats easy.
    Either buy 300x heads or cut to 62cc.
    300x computer or get a flash from the likes of simon motor sports.
    Porting is different. Also look up the exhaust chest and your block there will be some small blocks in there to grind out.
    Reed blocks are 5 petal not 6 like u will have. allso the reed plate it thicker.
    Fly wheel is also different.

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