Tick Tick goes the magnum.

Can you describe in depth how you measured? Here's how I do it. I order a pushrod checker straight from "whomever" I plan to buy pushrods from. Done this before with Smith Brothers, so lets say them. I get the checker. Get the camshaft lobes on the base circle. Now adjust the checker to take all the slack up, plus "however much" preload I think will work best for a given situation. I prefer a light touch with preload so I normally go .025"-.040" after all the "up and down" slop is taken out. Then, I send the pushrod checker back to Smith Brothers telling them "I need X number of these".