Home › Forum › Ask A Member › Can 1955 mark 25 lower drive unit fit 1956 mark 25 › Re: Can 1955 mark 25 lower drive unit fit 1956 mark 25
March 11, 2016 at 11:19 am
#33239
quote betty ann bernardd:
as I remember during the change over period some omc’s were “full jeweled” except for the wrist pins. I may be wrong I know more bout Merc’s than OMC’s
You are correct. Larger OMC’s were not fully jewelled until at least ’57. Up until then, a lot of non bearing wrist pins were present. Aside from that, oil is the cheapest thing you’ll ever put in an outboard. The extra two ounces will just prolong the life of your classic 😀