Ok, I think I finally got an answer. Thanks, guys!

Just to reiterate, by using an adjustable pushrod, I can determine the length that I need. I do this with the valves completely closed (lifter on the true base circle of the cam lobe). I just need to make sure that the lifter has some pre-load.

Then I use the measured length and buy new ones at least "that" length.

BTW: My machine shop did make sure that all of the valve tips were at the same height (cutting was necessary in many cases). I probably should still check the length of one push rod on each head.

Just to be clear, the valve to piston clearance was not the reason for getting new push-rods. I only want to make sure that the push-rods that I'm using (or need to buy), are the correct length.

Thanks!

Tim...