Ford Mustang/Capri 1979-1988 Repair Guide

Valve Guides



Worn valve guides can, in most cases, be reamed to accept a valve with an oversized stem. Valve guides that are not excessively worn or distorted may, in some cases, be knurled rather than reamed. Knurling is a process in which metal is displaced and raised, thereby reducing clearance. Knurling also produces excellent oil control. The possibility of knurling instead of reaming the valve guides should be discussed with a machinist. However, if the valve stem is worn, reaming for an oversized valve stem is the better choice, since a new valve would be required anyway. In any event, consult with an automotive machine shop for advice.