Terry, even though I did an Arjay pour I would not think twice about raising it with another pour. I would drill 1/2" holes every four inches or so down in the transom, both vertical and horizontal, and epoxy some 1/2" fiberglass rebar for the new pour to adhere to along with the outer/inner skins. The big structural issue will be the fiberglass skin to pour into, that's where I'd go heavy with splicing in the new sheets of fiberglass to the existing transom....minimum 3/8" thick. I wish I had known, when I sold my house in August I threw away the old transom skin off my brother's '72 I/O, that was an easy 3/8". Would have worked perfect. Good luck!!
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