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Thread: Port timing

  1. #1
    Team Member
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    Feb 2009
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    Default Port timing

    Snagged a 3 cyl. OMC w/ 15" mid for my next project. Does any one have a port map from the mod 50 days. Before I design a port map I would like to have something to compare it to. The powerhead is actually a 56 ci motor. The adapter plate was modified. Thanks.

  2. #2
    Sam Cullis Mark75H's Avatar
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    Nov 2004
    Annapolis, MD USA
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    The porting is only part of the picture

    To make it work, you need the pistons, head, front end & carbs
    Since 1925, about 150 different racing outboards have been made.

  3. #3
    Team Member Jackson's Avatar
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    May 2009
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    I beleive that the Ex. opens at 90deg from top and the In. opens at 120deg.

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