Thread: Advice on measuring valve stem diameter

Hoping someone with more experience can give me a little advice here. I'm rebuilding my VE and at the moment measuring the valves and guide to determine clearance values.
Here are my questions:

Where is the proper location to take the measurement on the valve stem?
If I take it above the gray line (see picture) all valves are below the standard size limit. If I measure it below the line, they are just a the low end of the spectrum. The FSM doesn't seem too clear on the exact location to take the measurement.
I did measure at several locations on the stem and they are within tollerance, not excessively worn.

Next, does this matter? Or should I just be concerned with taking the measurement and subtracting the valve guide bore size to just determine if the clearance is within spec?

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I imagine you want the diameter where the stem sits in the guide at rest, and then maybe up the stem some if you want to be really picky. This should tell you if the valve is as strong as expected?

The diameter of the guide bore minus the valve stem diameter will give you the clearance which is important for sealing and proper stroke control I guess?

Each seems important in its own way.

Good points. Thanks!

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