You have a bending beam torque wrench. The one I have has a set screw holding the pointer and the pointer is tapered so it will move the point as it is turned. All in all they seldom go out of calibration. Start in the middle of the head and work your way out; go up to first torque in 2 or 3 stages. Set valve clearances a little loose, start engine and get it to operating temperature and retorque and set final valve clearance. When you torque sneak up on final slowly; you will feel the fastener creep to the end point. As others have mentioned chase the stud holes with a tap and wire brush the bolt threads. Had a 172 blow a head gasket between 2+3 because it was running on 2 cylinders (every other one in the firing order). I surmise the uneven heat took out the gasket. I would make sure the ignition timing was right on; retarded timing will push BTU's out the exhaust and water jacket. Ditto for running carb lean. Check the head and block with a framing square for flatness. Check for sedimentation or casting sand in the block with a probe.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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