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Originally Posted by somf
I guess I answered my own question, I dug out the Ford service manual and it states .015 for both valves on a NA engines hot or cold. Interesting to know how Lehman came up with .015 and .018 in the Owners Manual?
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I have several Ford Lehman manuals and various data in them is all over the place. Like you, the manual I just looked in says .015 for Intake and Exhaust for NA engines. Yet in this same manual, it says to check the valves at the first 50 hours and then it never indicates that they need to be checked again! Another manual I have (my hardcopy) says to check them every 600 hrs. I believe the info that they can be done cold has come from American Diesel. (At least that's what they told me). I think their exact words were "That will get you close enough". One way to prove if its necessary to do hot is to do it hot just as the Owner's manual states, then check them again when the engine is stone cold. If they're still within reason, then it could be done cold.
Ken