Originally Posted by Justaddwata

Tough to call but I imagine it is possible as long as you did not stage it for long (at all) and allowed a full cool down between races (could even flow some water through it when in the pits after the race). I have seen plenty of boats started and run for longer than I would feel comfortable at revs higher than I would pick before launch or when tuning - and then there are those times a boat runs ashore and revs an unbearable song - so they can do it and survive (sometimes).. Another option might be to fill the head with water before the race and seal with a silicon hose that will blow off with pressure - though dangers from steam scalding. Might afford the motor a little extra run time though. Full size drag racers dont get many races out of a motor - this may be the case with using a water cooled motor without cooling too though.