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  1. #1

    Join Date
    Apr 2007
    Lake of the Ozarks

    Long Block 12f & 15f difference?

    I looked on the parts break down but got lost when they have the same number but add suf A or B. Besides the cams, are the heads different? Where does the extra CC come from, I think the crank and rods are the same, just bigger bore, is this true? So could I just change pistons and cylinder? I know everything outside the long block are different.

  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    crank, rods, pistons, cylinder jugs, cams, intake and a few other things are different, the bore is the same 83mm its the stroke that changes


  3. #3

    Join Date
    Apr 2007
    Lake of the Ozarks
    Ok, so converting a 12 to a 15 is pretty much out of the question.

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