13 years ago, I tried to align my 12V71TIs engines in our 58' Bert MY. I soon discovered a hornets nest. All the rubber in the engine mounts were crushed and bottomed out. Working with a rubber shop here in Jacksonville, I purchased high pressure rubber doughnuts that would fit nicely and reassembled as best as I could. Well it did raise the engines back up, but adsorb vibrations,,, NOT. It's time for the correct mounts and for the boat to stop vibrating as we cruise. My old bones would be more happy also. Any mount experts out there?