I agree w/Destroyer...double up on large volume bilge pumps AND seperate batteries to run 'em...
The '74 I started my V20 journey in had an open bilge well w/no self drainage as do all V20s in the 70s...I had a single 850 GPH Rule w/an auto switch which I now consider inadequate...thankfully never had a problem. When the large wave comes over the transom and fills the back of the boat is when you'll need TWO (or more) 2,000 GPH pumps and TWO HOT batteries and hopefully a running motor.
But as Spareparts points out, the typical drains in self bailing hulls are grossly undersized for the worst case scenario...I upgraded the thru-hull fittings and hoses in my '84 to 1 1/2", but am under no disillusions about what will happen if the big one comes over the back, ESPECIALLY if it kills the motor...
