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I am in the process of replacing the cockpit drain hoses and thru-hulls and adding valves on my '76 R33. If I were not increasing the diameter of the thru-hulls, I would not replace them and would instead thread on a valve since the thru-hulls are bronze and good condition. I'm tempted to go that route, but have already bought the through-bolt style sea cocks and keep telling myself the additional 0.25" diameter is 44% more area. So assuming you can get matching threads on the valve and the thru-hulls are not corroded, it's a much simpler task to keep them.
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