2 ways to do it, with the valve close adjust them till there is no slack in the push rod but you can turn it, second way and most effective is once the cam is bedded, get an old rocker cover,cut the top out and instal it. Run the engine tighten one rocker at a time back them off till they rattle, then down till it misses, then back them off till the cylinder comes back and then a bit more.