Valve adjustment on Ford 200ci six cylinder?

To adjust the valves on a Ford 200ci six-cylinder engine, first, ensure the engine is cool and remove the valve cover. Rotate the engine to align the timing mark on the harmonic balancer with the TDC (top dead center) mark on the timing tab for the cylinder you are adjusting. Using a feeler gauge, set the clearance to the specified gap (typically around 0.018 inches for intake and 0.020 inches for exhaust) by loosening the lock nut on the rocker arm and turning the adjustment screw. Repeat this process for each cylinder, then recheck the clearance before reattaching the valve cover.