Nah, throw on another layer of 1708...
Its not necessarily a strength issue, its a transom assembly issue... The transom plate and gimbal housing are designed for the specified 2- 2 1/2" and if its less than that, the mating parts may bottom out before the hardware is tight...
It'll only take you 20 minutes to throw on another layer of 1708... Just cut out a piece (or even 2) that are a littler bigger than you're transom plate and glass em in and be done with it.
Again, its not for strength, its for the proper transom assembly... proof of that is, merc has the same exact dimensions specs for the transom for a 3.0L as it does for a big block 7.4L... and probably even their racing engines
I will, not looking forward to it though lol. I was going to start grinding the lips down yesterday but curiosity got the best of me I had to know what was making the blobs holding my front mount in. Still dont know what it was but it certainly was not very friendly with my tools.
Possibly a previous repair and a product called Sea Cast or similar to. This stuff can be mixed, poured into a void, and it hardens up like a rock. A buddy of mine used it when the wood core rotted out of his motor mounts. He cut the top of the boxes off, cleaned out the wood, the poured it in. Once hard, he capped it with 1708. It made a really nice repair.
I have up to the ski locker grinded. Unfortunately I am not hitting that sweet pink color as in other restos. Looks like the previous owner put a layer of CSM and cloth down on the hull at some point so I am grinding off that first layer of cloth and it is a whitish clear color. It definitely looks white in the picture due to the dust lol.
you can see at the bottom of the pic where I stopped grinding it is a yellowish color. But underneath that layer is good and solid
Just curious (as I've yet to do this myself on my project), are you grinding down the entire surface of the hull? Or just where your transom, stringers, and bulkheads were tabbed in previously?