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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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