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Recent content by skippysham

  1. S

    MERCRUISER ENGINE OPTION CODES

    I could use some help in deter I could use some help in determining exactly what engine I have in a Shamrock 20. It is a GM Mercruiser with reverse rotation. The only numbers that I can find are a 13 digit Mercruiser Option Code on the S/B side valve cover: 1211112040260 and the firing...
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