As far as I know, the only engines that would require that kind of torque would be ship's engines or locomotive engines - or perhaps a Waukeshaw that was set up to provide power for a whole community. 350 ft-lbs is a very lot of torque. Any fasteners that require that much torque are not likely to break if the torque is off by 10%. However, I would suggest that you use the adapter with a breaker bar, and use the length of the moment arm (in feet) times the force applied (in pounds) to reach the desired torque. Using a pull scale, it would be as accurate as a torque wrench that has not recently been calibrated. Using the same tooling on every head bolt would result in the torque being evenly applied. I have been rebuilding engines and transmissions for over 40 years, and while torque is important, it is more important that it be evenly applied and in the proper pattern. I'm sure that there is a formula for figuring the use of an offset, but how to figure it escapes me. Using a pull scale is actually more accurate than the average breakaway torque wrench anyways.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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