Valve Guide: Service and Repair

Valve guides in these engines are an integral part of the head and, therefore, cannot be removed. For service, guides can be reamed oversize to accommodate one of three service valves with oversize stems (0.003 in, 0.015 in and 0.030 in). Check the valve stem clearance of each valve (after cleaning) in its respective valve guide. If the clearance exceeds the service limits of 0.004 in of the intake or 0.005 in on the exhaust, ream the valve guides to accommodate the next oversize diameter valve.