He needs to give more info. My bet is his push rods are too long. He said he has adjustable rocker arms so between the camshaft and the rocker arms something will be off. It may be good he walked away for a bit. When he goes back at it he may just see what is wrong. Mom always said come back with fresh eyes. Sometimes it works. Sometimes you can't see the forest for the trees.
You would have thought that he would have noticed the push rods were to long when adjusting the hydraulic lifters ie with spring pressure on the push rods thus hanging the valves open you would not be able to spin the push rods with your fingers.
