A properly functioning EGR valve or exhaust gas recirculation valve will open and allow for exhaust gas to be reburned in the combustion chamber to ensure excessive soot is not emitted to the atmosphere. Typically, these valves will fail due to an excessive amount of soot clogging the valve creating a situation where the valve partially opens or does not open at all. This can cause problems with overall drivability and can cause other vital engine components to fail. Replace your failed EGR valve in your early 6.0L Powerstroke with this remanufactured Grizzly EGR Valve. This EGR valve is designed as a direct replacement and meets or exceeds factory specifications.