Measuring cam degree by piston movement??

[BLACKCAT]

How accurate would it be to degree camshafts, to find 0.05" cam lift, by measuring piston movement starting from 0 at #1 TDC & knowing the stroke is 3.58" & maximum cam lift is 0.336"?

 

[Doward]

I wouldn't trust it, due to timing belt slack. Measuring from above is dead easy on OHC motors.

I actually measure both crank and cam degrees when checking my I/E O/C settings.