could you tell me how many threads you have showing or how far the ball adjuster is out odf the rocker arm,I have the 1621,s and am just now going to try to getpushrod length,I heard the oil hole in the center of the adjuster must line up with the hole inside the rocker,is this true or does oil find its way throught the threads to the holes if they are not alighned,any help with this if you can,thanx