i usually do method B but this year didn't have time. we ran it up to temperature on water (so the thermostat opens), fogged it, changed the oil, drained the block, shower, heater, manifolds and blew air through the system. Then I simply pulled out the OUTLET tube on the impeller housing, lifted it up and poured 2 gallons of marine/rv antifreeze down it. Since the thermostat is open from being hot, the antifreeze goes into the block and....all done.
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