Automotive Valve Clearance Adjustment (20R/22R/RE/RET) The EngineerDecember 5, 2022December 5, 20220 Advertisement Why Is It That Important? The valve CLEARANCE WILL CHANGE after a good period when the camshafts, valve seats, and valves wear in. This is very common on any engine with a rocker arm setup like the Toyota 20R … Read More