How do you adjust valve clearance of 12 valve engine ford wl?

To adjust the valve clearance on a 12-valve Ford WL engine, first, ensure the engine is cool and remove the valve cover. Rotate the crankshaft to align the timing mark with the TDC (Top Dead Center) position for cylinder number one. Using a feeler gauge, measure the clearance between the rocker arm and the valve stem for the intake and exhaust valves, adjusting them using the appropriate adjusting nut until they meet the specified clearance. Recheck the clearance after adjustments and reinstall the valve cover.