The idea of a wet test is that durring the wet test the oil seals the rings and compression should increase otherwise you have valve problems. Also since the engine was stuck you may have stuck oil rings which will not show up real well on the compression test. However it may consume excessive oil when the tractor is under load. I would also use a vacuum gauge test and I have never done this on an L-head engine, but a cylinder leak down test migh be order. Send me a U. S. mail address and I might be able to send you some information we used to pass out from Perfect Circle. John