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 - Torque Wrenches - by Curtis Von Fange. When working with fasteners a torque wrench can play an important role in the correct assembly of critical equipment components. Lets examine in detail some of the reasons for using a torque wrench along with how to correctly use the variety of wrenches available. Applying the proper torque to a fastener accomplishes a number of tasks. First of all correct torque will hold the parts together. This may seem like a trite statement but � think about it for a second. Engineers have designed
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