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I would go with Loctite 262 (the red stuff). According to Loctite and "Engineer to Win", by Carrol Smith it is the right stuff for the job. It has a 300 degree F temperature limitation, which should be plenty for the pulley bolt. If that's not enough, it's the least of your troubles. Oh, yeah, like any other Loctite threadlocker, it can be removed easily by heating the part about 50-75 degrees F above the temperature rating. It should soften and the part can be unbolted easily then. If you have any doubts about it working, let that same part cool down for about 5 minutes and try to turn the fastener again, it will be locked again until you re-heat it. Be sure to clean any Loctite residue off of the parts before reassembly to ensure proper torque. I'm a big fan of researching sh*t, especially when it costs lots of money or makes obnoxious noises when I'm cruising. I would recommend the aforementioned book, or better yet "Carrol Smith's Nuts, Bolts, Fasteners, and plumbing Handbook". Yes, they can be every bit as boring to read as the titles suggest, but they are both packed with good info for the daily driver mechanic or race car owner. Thanks for paying attention, class. Hey! Toby, I know you're not planning on throwing that paper airplane in my classroom! Jake Kooser '71 Squareback (the little girl) '66 type 1 roadster (the project car)