pushrod length

Don’t need to rotate the engine or try to set preload with the adjustable pushrods in it. Here’s how I do it.
Rotate whatever cylinder you’re working on to TDC compression.
Install everything. Set the adjuster on the rocker where you want it, (IE 2-3 threads showing underneath) then adjust the length checking pushrods to zero lash. Take the pushrods out and measure them. Add whatever preload you want to the measurement and order that length.