Originally Posted by leathermang

Can't go with that because the lock nut and the top nut are in opposition to each other... and good threads on the top of the valve and inside those two nuts.. if they are tightened correctly will offset each other much more than the tiny input of force from the rotators .....the FSM suggests if you are having problems with keeping the valve clearance what it is set at.. put new nuts on the valve... but be sure the type of top nut matches the type of cam being used. ( hardened, chilled, etc )...