brackets and engines

[warthog5]

Another thing to consider. If you use the same bracket that is designed for a 25in shaft and you still use that bracket and raise it for a 30in shaft. The boat will settle in the water farther down. So you will have defeted what you set out to do with the 30in shaft.

The reason for this is you will have elevated the tub that add's to the flotation of the boat.
A whole other bracket with a taller tub would be warranted to run a 30in shaft and pick up the flotation so the boat sit's like it does now.