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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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