Good Day. A friend just fired up his fresh engine with a hydraulic camshaft. He was planning on re ajusting the lash after the cam has been broken in. Is it necessary to recheck this? I was to the opinion that when building the engine, you adjust the the rocker nut so there is no clearance between the lifter and push rod. A additional 1/2 - 3/4 turn of the rocker nut would put the lifter plunger in the middle of its travel. I can not see how running the engine would change anything. He tells me the oil will pump up the lifter. I thought the oil was a cushion and would self adjust to any wear that occures after time. If re adjusting is necessary, does G.M. do this to all their new cars or engines? Personally, I don't think so. Anyone care to clear this up?
Thanks in advance.