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The QDs changed to the small 4-bolt gearcase in 1958 so that’s where the difference is for the QDs. 1949-1957 will use one and 1958-1963 will use the other one. I use the 15-18hp test wheel (5-bolt gearcase) for my 1949-1957 QDs. It isn’t perfect but is fine for my purposes. I have the right test wheel for the 1958-1963 QDs. I currently use a 55-gallon plastic drum. This works fine for the 5.5-7.5hp motors, but 10 and over will still ventilate some at WOT. It does let me get them quite close in the tank before dialing in on the lake. I dont have the part numbers handy, but I’m sure Dan will have them.
-Ben
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