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 - The Great Escape - by Dave Hollrah. It all began Monday with a little baling of second crop on the lake shore field, and as I drove out past my sister and her hubby's place, this small calling sound could be heard from the general direction of their manure pile. Out of the yard, over the cows and bale piles, through the dozer piles, poplars, and brush, out onto the ditch grade road, past the noisy 6.2 diesel engine pulling my well traveled Suburban along. Well it sure didn't take me long to figure out what it was because I alrea
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