Update: The adjusting screw with the nut backed off is very loose in the rocker; they can be wiggled side to side in the rocker arm. I suspect either the diameter of the adjusting screw and rocker arm don’t match or there is excessive wear. I can’t imagine the adjusting screw should be so sloppy when threaded into the arm. It is tricky to get the correct lash set; when locked down the adjuster moves up as the threads mesh/grab.

I have ECG rockers with adjusting screws and lock nuts, is there a torque value for tightening the lock nut? Seems like there is a potential for the nut to loosen while running the engine.

I found this post: Rocker adj nuts




.150 Stroked Y-Block:327.25 ci @ >1hp per ci