I am really feeling dumb. I am doing some touching up of the engine compartment and decided to replace the valve cover gasket and adjust the valves on my '70 4/4 Kent 1600 crossflow head. I cannot find the locking nut on the rocker arm adjusting screw. There is just a hollow threaded screw that goes onto the pushrod. What am I missing? I've adjusted valves on a lot of cars and there has always been some nut to secure the threaded adjuster in place. Is this threaded screw an interference type that requires a lot of force to move and then stays put. Seems unlikely but something must hold the screw in place. Any help would be appreciated.
