Re: Upper crank case seal differences.. Home › Forum › Ask A Member › Upper crank case seal differences.. › Re: Upper crank case seal differences.. garry-in-michiganLifetime MemberReplies: 3583Topics: 31 June 17, 2017 at 1:43 am #59806 Some one in accounting found a better price on the seal and never consulted engineering. (How OMC went bankrupt.) . . . 😆