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If it runs OK and there is no evidence of coolant in the oil AND there are no bubbles in the radiator, I would try a good dose of stop leak. I have had this work for me on other engines. It also wouldn't hurt to check that all of the headbolts are torqued properly, but that is a fair amount of work and you probably need the tractor for snow plowing right now. Something else that can lessen a coolant leak is to not pressurize the cooling system. If your radiator cap does not have a pressure release lever, one way to make the cap a non-pressure holder is to remove the gasket from where it would contact the bottom of the radiator neck. If you have an old cap that will fit on the neck, that is the one to modify, since it will never work as a pressure cap again. In my experience, a blown head gasket usually makes the engine run real bad, if at all and it also puts lots of air or exhaust into the cooling system, which fairly fast blows lots of coolant out the radiator overflow. I once had a slant 6 that had coolant leaking into the oil from somewhere, but only a little bit. Stop leak fixed that problem and I drove that car for years afterward with that same engine. Of course I changed the oil as soon as I noticed the excess moisture in it and monitored the oil very closely for awhile. I have had good luck with the stop leak that looks like powdered aluminum. What you are looking for in the oil is a whitish foam or an excess of moisture coming from your engine oil breather. If you see the oil change color fairly suddenly, you probably need to not run the engine anymore, at least unless you change the oil and filter. Running the engine with the antifreeze contaminated oil can really damage the bearings in the engine fast. But if there is no change in the oil, and there are not bubbles in the radiator when the engine is running, you are probably OK to run it awhile to give the stop leak a chance to do its job. But check your oil and coolant levels often! Good luck and be careful.
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