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Great ideas. What's WB? ...but it's either convert to WB...

I saw that a member noticed what appeared to be excessive lash in the cam drive gearing. Another member recommended comparing the factory specs. Problem with that is that there are no factory specs - ain't none published. Lycoming apparently thinks we Lycoming owners don't need to know.

Let's say you want to know if your good ol' Piper's cam is still providing full valve lift. There is no info published. So you call Lycoming. Tech support informs you that it's proprietary. A lot of help are they.

Let's say your thinking of replacing the cam in your O-360 or O-320. You look up parts in the manual and learn they have a handful of supercedures for the camshaft part numbers. It would be great to be able to compare the new specs to the obsolete specs.

Lycoming thinks the valve timing info should be kept secret from Lycoming engine owners.

The Continental service manuals for both of my engines provide the cam specs, the actual valve opening and closing timings. Lycoming doesn't include the information. I wanted to check my O-320-A1A. I tried to get the valve lift specs, and the opening and closing of the intake and exhaust...

Too bad no resolution ever became of this old thread.