Kinda tricky to explain and I'm not sure if it's factory installed. On my 23 there is a "pocket" 3" x 3" about 1" below the deck where the water collects and then goes about 2" down through a 3/4" pvc 90 and then out he back. If I went out the side using the pocket as the lowest spot I would gain about 2" to maybe 3". I'd do like Ken, out the side with a clamshell to keep water out when running. With 3/4 to full fuel and the new heavier engine the pvc drain out the transom is now always below the water.
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