Hll #359 has a 2GM raw water cooled engine. It runs great but does vibrate alot at idle. Its surprising to hear from Joe that this was the improved vibration model. At idle the deck looks like jello. Its fine once its under load. Maybe a little loud. I did add a significant amount of insulation to the aft compartment that did wonders for the noise.
I did have a cooling water problem that turned out to be rust in the head and block. Soaking it with a mixture of oxalic acid and water periodically keeps the problem managable.
