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Been playing with Mercury’s the last few years, started getting into the 1957-58 Johnsons up to 35hp. I’ve got running and using a 1957 5.5- 10hp Johnsons. Those motors always ran deeper in the water than the Mercury’s. I always set the cavitation level with bottom of boat, if not a little bit above, on the Merc’s, never had any problems. Always installed Johnson motor’s on fishing boat deep enough so that 1 inchx5inch plate above the cavitation plate was in the water. ( I believe that is the cover for the water jacket which is about 1 inch x 5.) I would think or wonder if that depth would cover that plate or whatever that plate is called. I’m thinking that 3 finger picture would get it done. I got a couple of 1970’s Johnson’s 4hp and 15hp that don’t have that plate. I wonder how long OMC ran that set up, and what problems they had with it if any? I’m ready for Spring, winters are getting too long. Gene.