Was talking to a guy yesterday and a subject of breaking in a fresh rebuild came up. He mentioned that the dealership in Texas that rebuilt his motor does an "ON THE TRAILER" motor break in. Boat is strapped down on the trailer, diagnostic equipment hooked up, taken around back to their own little man made lake and launch ramp, backed into the water, prop'd toward the high side to ensure motor is always loaded at RPM's, then cycled through stages of RPM's and cool downs for periods of time. This also gives them real time analysis of motor condition after the build.
Sounds like a Dyno Pull of sorts in a controlled environment, but does it actually work better than running a lake or river for break in ????????