SOURCE: After having heads rebuilt and
Replace the adjustment nuts with new ones, they are a special type of nut that keeps its setting by friction between the crimp and the threads, this friction is given by a slight crimp to the nut that makes it out of round near the top of the treads, u can also install a product to the threads called Loctite red thread lock, U can also buy locking rocker arm adjustment nuts that use an allen screw to "lock" in the adjustment, these are avail from amny speed shops, one i use is Summit racing, another is Jegs speed, please keep in mind that other factors can cause this, one is low oil pressure caused by a camshaft bearings not being installed correctly, there are holes that allow oil to flow properly, if they are not lined up correctly to the block oil gallery then this can starve the lifter for oil pressure and they get noisy.
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