They have a little snap ring to limit the depth inserted in into the head.
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Overview
* 13212-H0112 GUIDE-VALVE INTAKE $8.08 * 13213-H0113 GUIDE-VALVE EXHAUST $8.25
The original guides (13212-H0110) were bronze. Someone said the newer part numbers are "steel" with improved wear characteristics.
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Inspection
With the valve off the seat, move the valve side-to-side parallel with rocker arm.
The service specification (maximum allowed play) is:
- At the valve stem end, 7.9 thousands (0.0079 inch)
- At the valve head, 1.2 thousands (0.0012 inch)
Also see: Valve Spring Removal