Adding the trim tab pocket vent is a fairly common fix for the aft end sucking down hard into the water when heavier 4 strokes were installed on originally 2 stroke boats. I am not sure if the vents were at some point in time the factory standard. I am also not so sure if they are installed on newer hulls. I was under the impression that the tab pockets were redesigned to eliminate the problem.
If anyone knows for sure what the history is, I would love to know, especially what model/year hulls experienced the problem.
If anyone knows for sure what the history is, I would love to know, especially what model/year hulls experienced the problem.