Re: 1973 23' CC question about I/O to Outboard issue.
CaptScott
I'm with Chuck ... that water line looks fine in its current configuration (That boat looks like its in pretty good shape too ) Like you say the problems with a newer heavier motor on that setup would be drifting and squatting ... I (personally) would not put a bigger motor on that bracket. I would be inclined to think you would most likely see a lot of water on your deck through those scuppers with a bigger motor and that current bracket.
Like Scott confirms above the boat with an I/O sits lower in the water than a boat with just an outboard. That would say to me that there is no more apparent difference in buoyancy in an I/O built version over an outboard version. Putting a 590lb (or the extreme a 650 lb 250hp Verado) on that engine pod with a 26”-30” setback would be an awful lot of weight…unless mounted on one of the newer generation brackets that have the high buoyancy numbers …Like the Potter SeaMark bracket (890+ lbs of buoyancy) Then its not an issue.
Generaider would be best to chime in here. I’ve heard real good things from him and several members, including Capt Chuck, about the performance of that boat with the proper bracket and 850+ lbs of motor back there. I think with a bracket in the style he has ( the seamark) he has essentially extended the running surface of the boat ... effecting the ride in a positive manner giving it a bigger feel when running. Remember most of the other brackets typically do not follow the running plane of the hull, and are similar to what you have... they attach low on the transom and then angle up towards the engine mounts. But more and more companies are changing that design with these higher weight motors becoming more prevalent. Some of these other brackets, like Generaiders, follow the shape of the v in the transom, extending aft on the same plane as the hull. You almost are adding a couple of feet to the boat …. I remember a picture of Generaiders boat during the restore that showed the trim tabs on either side of the flotation chamber ….there was even more running surface.
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