273 rocker push rods

The ball and cup diameters match up close to the factory solid lifter 7.500 rods. The 7.234 rods are just to long. Some would rub against the rocker and not achieve zero lash. From what I have found from searching different threads is that that the adjuster needs to be exposed any where from 1 to 2 threads or 1/4" to 9/32" to provide proper oiling to the push rod.