Putting ANY kind of "dope" on the threads of a head bolt will affect the ability to keep the torque constant. Are you REALLY worried about the head bolts backing out? Never seen it happen on a Cub in my 40+ years of wrenching. If that thought bothers you, you might try some LocTite...but be prepared for a cussing from the NEXT guy who has to remove the head.
The ONLY engine I ever saw that required any sealant on a head bolt was the '66-up AMC V8's, which had ONE head bolt that passed through a coolant passage, and required #2 Permatex. Since a Cub doesn't have that occurring, I have NO IDEA why you'd want ANY sealant on the threads. Because a properly torqued head, with no cracks and a flat surface, sealed with a quality head gasket to a flat block deck surface with no cracks, simply IS NOT going to leak.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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