Thru-hulls

[pogden]

This is my first post and I want to say what a great site.
I have been reading all the prior threads I could find on thru-hulls, but thought I would ask anyway. I just purchased a 1978 Master Angler. It appears in good shape and was actually garaged every winter here in Pennsylvania. I put it in the Delaware for its maiden cruise and all went well.
When I had it on the ramp checking the trailer straps, I pulled the drain plug and appoximately 5 gallons of water came out. Now to me that was alot. I didn't take on any water that I knew of (spray, back-wash), I didn't run my bilge. Was this alot of water for a 2 hrs. cuise?
Do you think it came in from around the thru-hulls? Do I have a cracked hull?
Should I worry about it, or just run the bilge?
I have not had a boat since I was a kid in Marco Island fishing the Ten Thousnd Island from a 10' john boat ..it was paradise.
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Thanks,
Pat