I've used a heating blanket with good success, the problem is getting a heating blanket that does not automatically shut off. I would turn the heating blanket the night before predicted snow and wrap it around the engine, I never had issues starting in the cold. Also you could install a hotter plug, that and a well tuned engine should turn over easily in cold temps oh and a lower weight oil can help. I use SAE 40wt in the summer and, when I lived in MD, 30wt in the winter.
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