Valve Clearance on Larger Camshaft and Flat Top Pistons

I’ll ask one more time.

How do YOU determine if it’s the rocker flexing or the pushrod.

Use YOUR OWN WORDS big boy.
Under what conditions? Are you talking about deflection when turning the motor over by hand against the spring I would would be using vs a checking spring? Also what did you think my theory was? I think if you answer that it will help figure out where the disconnect is.