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 - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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