The first boats had 130 gallons, then 150 (Mine definately has 150, and I put in about 73 to 74 gallons per tank). I ran the boat 30 miles and still had an expansion problem on hot days. The initial fill was with the boat on the trailer. It is only the port side which overflows thru the vent line--I suspect that when the vent tube was welded in place, it was put further into the the tank, than being right at the surface. The fill and vent are both in the back of the tank--the vent should be in the front of the tank.
Later boats--and I don't know exactly when, boats only have 130 gallons.
So early and boats toward the end of 2006 have 130, the early part of 2006 have 150 gallons--my hull is #39 and was started about May 1, finished about June 1.