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#55308
Leon
Participant

    Agreed. I don’t see where I mentioned anything about powerhead swaps, but you are correct.
    Thermostats came in OMC twins, in ’59 and later (except for 28 and 33 hp) and ’58 and later for the Big Twin models.
    Oddly enough, the 28 and 33 were derived from the older Big Twins of 1956 and 1957 with two less horses each.