[cstreit]

In a perfect world, you shouldn't be getting differential timing readings from an adjacent cylinder...

Things to check that could result in differing measurements:

1. Where are you doing the measuring? If your dial indicator is not parallel to the valve when you do the measurement.. If the indicator was at a significant non-parallel angle it would result in a higher lift reading.

2. If your valve adjust is off, low reading

3. A bent valve. Low reading

4. Badly worn cam lobe. Low reading.

Any one of those could result in what you are seeing. I'd check #3 and see which one is off the other two, this is probably your suspect location.