The pushrods length has to be correct to get the correct geometry on the rocker as it travels up and down on the valve tip.
A set of 3 pictures of the rocker tip on top of the spring while the spring is holding the valve closed, mid lift and full open is what you will need. Also, before you start taking the pictures, oh need to remove the rockers, clean the valve tip, take a black sharpie marker and color the entire valve tip. Then reinstall the rockers.
Starting from the valve fully closed, rotate the engine so the valve opens and closes. Take your pictures and then remove the rockers to photograph the valve tip that will show the scrub area made by the rocker tip.
WOW! That is a lot right?!?!
But this is getting it done right.
