Re: 33 VS 35 hp OMC.

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June 13, 2018 at 11:50 pm #77870
DAN ANDERSON
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    This may not be what you had in mind, but while you are waiting for an answer I use eBay pictures to help. I put in the 33hp head #311170 and a few came up. Pictures are pretty good. One looks like they actually stamped 170 near the spark plug holes in the combustion chamber? I have a 1965 model. It’s missing the motor cover, starter, etc. I know the pistons are different (part number) & of course the head doesn’t have compression relief valves. Never got a chance to measure port height or anything?

    https://www.ebay.com/itm/NOS-OMC-EVINRU … 1438.l2649

    https://www.ebay.com/itm/P45-New-OMC-Jo … 1438.l2649

    Dan in TN