how do you measure pushrod length? does it have to be the #1 cylinder on the intake stroke???

 

first you need an adjustable length pushrod which are 10 dollars and you need to setup the full valvetrain preferably with setup springs instead of your regular valve springs, set up both intake and exhaust of one cylinder and you can then begin to measure and play with rod length and check wear pattern on the valve stem by using machinists blue dye.