On our PNW cabin cruiser he uses what Tri County Diesel installed on our engines back in the mid-2000s. He was just a puppy then but even then he knew who to listen to for credible advice.
As an engineer with a lot of boat design/manufacturing experience under your belt, Eric, an aside to this topic you might be interested in is what seems to be a fairly rudimentary design error on the part of the fairly reputable manufacturer of our boat.
The mounts in our boat are actually slightly under-rated for the weight of the engines because of the lack of clearance between the top of the engines and the underside of the cabin sole beams. Mounts rated for this particular engine weight put it too high and would require fabricating custom replacement mounts for the engines or modifying all the stringers, both fairly expensive options. So my dog (and I and the head of engineering at Northern Lights/Lugger) opted for the easy out which was the slightly smaller mounts.
The mounts that were on our engines when we bought this 1973 boat in 1998 were the originals, and they were slightly undersized, too, for the same reason.
Single engine 36's from the original 1973 molds don't have this situation. And I assume that the twin 36's made with the molds that replaced the originals in 1988 don't have this issue, either, as the new molds made the boats taller.
So I guess someone at American Marine mis-read their slide rule way back when.
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