Originally Posted by dparker
The more alum. you have the more growth. You should always set your valves hot and then check what they are cold. After which you could set them cold. I still think setting your valves at operating temp is best IMO.
Yup, setting hot is best and most accurate without exception. There is not a short cut to the correct setting's. More mass makes larger diff in lash with temp. Cool is not a temperature, it is a relative measure. Is cool 45 deg 75 deg or 100 deg? Big differences in cool temp's and that deserves mentioning. I do my valve lash at 125 deg which is what I call hot with my drag race only engine. Ambient temps in Tuscon Az are close to the coolant temp I use to lash my engine. You should always go to an exact temp to adjust valve lash and repeat the adjustment every time at that same temp. If you think about the temp difference between ambient and 125 deg, there could be a bigger variation in temps which some would call cool, not to mention, 65 deg is hard to repeat in the summer, 180 deg is much easier to repeat any time....................
Food for thought.
Bruce