Tim, you are right. The big motor in Super E is 59 cubes.
The motor on McCall's boat is technically a 15 inch, but it is a "BP" which was a weird one off mid and lower ... a full gearshift Super Speedmaster. The center of the bullet is basically the same height as a regular fishing motor, but it is actually heavier than a fishing motor or Speedmaster equipped motor. The bullet size is in between the two.
Judging by how well the boat floats that motor, I'd say it looks fine to me
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