Cam engineering is the real issue. Cams for flat tappets (non-hydraulic) have a clearance "ramp" at the very beginning and trailing end of the lobe profile. This ramp is designed to take up the clearance over a set number of degrees of rotation. This ramp height is measured from the base circle (non-lifting part of the cam) to the exact point of the beginning of lift. The cold setting is wider because the valve stem, and pushrod length both increase with heat, as does the block and head. some of these decrease the clearance, (pushrod and valve) and others increase the clearance. The actual heat needed to set the valves is not full engine temp, but just warmed from running for 10 minutes or so. I would not second guess the cam engineering, as it is intended to create a quite and precise opening moment, as well as a crisp and smooth closing to clearance. Opening the clearance up to 16 or even 20 for startup would assure they wern't too tight before warming to be set "hot" Jim.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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