Pushrod length after milling heads

play the straub utube vid on "rocker geometry", highly recommended by Mike at B3 racing, a top of the line guru on this stuff. in a nutshell once you get the geometry right you hold the rocker "up" with your finger & at that point measure the pushrod length you need, adding .020" or so for preload if hyd or subtracting your lash if solid. EDIT & if you ain't changing geometry (raising/lower the shaft or screwing the rockers down the # of turns in the vid), just mock it all up & same thing, lightly raise the rocker with your finger & lengthen the checker pushrod as noted to take up the slack, & + or - a bit more depending if hyd or solid.