move each cylinder one by one to TDC, as each one is at tdc tighten the rocker down just to where theres no up and down play in the pushrod and then give it a 1/2 to 3/4 of a turn.... once there run it... then you can also do a hot adjustment which you run it with one valve cover off, loosen each rocker til it starts clattering and then tighten it to where the noise goes away, do each one until their all done, and bolt the valve cover back on and then do the next... take note that it is an oily mess and will help if you have an old valve cover that you can just cut a strip off the top big enough to access the rocker nuts