I have a 1998 40 hp Johnson that is mounted on a 13 boston whaler dauntless. This boat sits low in the rear and on decelleration sometimes the water comes over the transom and I am worried about the rectangular exhaust? hole at the base of the cowling. if the motor is running is it allright and no water will enter. Also when I flush the engine and put it up (ran in saltwater) should I squirt some corrosion block, etc. in this hole.<br /><br />Thanks,<br /><br />RKP