The guy I bought my tinny from cut the gunnel(lowered it),my new(old)40 hp is throwing water at me,I have since raised the transom 2 1/2 inches,so the cav plate is 1 1/2 inches below the hull.I haven't gottten to test it yet.Any thoughts?

What weight/HP was the tinny originally rated for? I ask because when I think of a tinny, it wouldn't be with a 40HP.....

The boat is a 1971,and no longer has the rating plate.She sits nice in the water with the 40,it's a 16 ft Starcraft,with about 6 feet of beam.
Just wondering if anyone has had experience with short/long shaft issues,or a cav plate being too low.I'm hoping the two inches I added,solve the "plumbing":)issues.

cav plate should be even with bottom of hull. it's too low if it is throwing water at you. you're on the right track but might need to come up a little more. within 1" should be ok but any more will usually cause problems. also be careful not to go too high or it will break loose in hard corners.
Ryan