ANDREW - IMHO, the head bolts & rod bolts are the most critical fasteners that need proper torquing, there's no main bearing cap bolts in a Kohler or they'd be tied for #1 in my book.
A ft/pound torque wrench will work, if the book calls for 240 inch pounds, divide by twelve, 20 ft pounds. But the problem is that ALL torque wrenches are most accurate at the top of their torque range, the percentage is different for ALL torque wrenches, depends on brand, but NO torque wrench should be trusted in the bottom 20% of their range unless specifically calibrated for those low torques. I use a 3/8" Craftsman bending beam T-wrench for my small stuff, think it goes to 500-600 inch pounds. My Craftsman Digi-tork 1/2" click-stop goes from 25 to 250 pounds feet. I almost bought a 3/8" Digi-tork when I built my K321 but it wasn't worth the $100 just to have the speed of the click stop over my bending beam for two rod cap bolts & nine head bolts.
Ohhh and NEVER loosen fasteners with a torque wrench, ONLY tighten them. Some people may disagree, but friends of mine have loaned me torque wrenches they depended on to do good work professionally and insisted I only use them to tighten bolts. I have OTHER tools to loosen them. I was told by them and other reliable sources that this kncoks them out of calibration quicker.
I'm a Tool JUNKIE, but not a tool Natzie, I don't make my living with my tools so to date, I only have ONE Snap-On deep well 3/8" drive 1/2" hex socket which was left hanging on a bolt on my truck from somebody at a body shop who repaired my grill 7-8 yrs ago. Most of my stuff is Craftsman, and lately I've gone with their better Professional grade wrenches. But for something like a torque wrench I would try to stay with a name brand like Craftsman, Proto, S-K, Kobalt, Allen, even Wright. A H-F T-wrench would probably be O-K, but I consider them something to hold onto for generations so I spend a bit more for what should be better quality. The wrench from AZ should be fine.
My Father-in-law was an Airforce mechanic in the Korean War. He spent a L-O-T of time wrenching on those huge radial engines. I just have a hard time understanding how ANYONE can afford to run something that burns 60+ gallons of high octane aviation gas per Hour per engine.
