I believe he wants to know if you used the 2mm Method and if you did do you feel you followed the instructions correctly.

The reason for the questing is that in the firs 20,000 miles the Timing chain is expected to stretch a bit. That makes the zero stretch measurement suspicious; especially if the Crank and Samshaft Gears were reused.

Using the 2mm Valve Lift Method to measure.
On a 617.952 it has the intake valve opeing at 9 degrees after TDC with a new Timing Chain and 11 degrees with a used timing chain at begining apriximately 20,000 miles.

That implys that a new timing chain is expected show some wear at 20,00 miles and that is normal.

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