Valve Guide Servicing

Check valve guides for wear. If replacement is necessary, press out old guide using drift (2818). Ream hole in cylinder head to oversize class 1 or 2:

VALVE GUIDE SPECIFICATIONS

Diameter

In. (mm)

Cylinder Head Hole, Class 1

.5195-.5207 (13.19-13.23)

Cylinder Head Hole, Class 2

.5313-.5326 (13.49-13.53)

Valve Guide, Class 1

⁽¹⁾.5228-.5232 (1 3.28-13.29)

Valve Guide, Class 2

⁽¹⁾.5346-.5350 (13.58-13.59)

⁽¹⁾	Oversize Valve Guides Shown

Using drifts (5108 for intake; 5109 for exhaust), press in new guides. Ream guides to 0.3150 - 0.3158" (8.00 - 8.02 mm). Check for burrs and be sure valves move freely in guides.