7-5
VALVES
Specification English Metric
Min Valve Stem Dia.
Intake .3095 7.861
Exhaust .3080 7.823
Min Valve Face .031 .794
Max Valve Guide .316 8.026
Inside Dia.
Valve condition is critical for proper engine performance.
The valves should be inspected for both sealing, and
wear.
Clean and inspect each valve face for distortion or
corrosion. Check the valve stem for wear. (Illust. 7-13)
Replace valve if stem diameter is less than: Intake .3095
(7.861 mm) Exhaust .3080 (7.823 mm).
If the valves have been checked and are in a usable
condition, the valve face should be ground at a 45 degree
angle. If after grinding the valve face the top margin is
less than .03125 (.794 mm), the valve should be
replaced. (Illust. 7-14)
7-13
7-14
7-15
The valves are not identical. Valves marked “EX” or “X”
are installed in the exhaust valve location. Valves marked
“I” are installed in the intake valve location. If the valves
are unmarked, the smaller valve (head) is installed in
the exhaust valve location.
VALVE GUIDES
The valve guides are not replaceable but should be
checked for wear. Using a split ball gauge and a
micrometer, measure the inside diameter of the valve
guides. (Illust. 7-15) This measurement should not
exceed .316 (8.026 mm) If a guide is found to be out of
specification the cylinder head will need to be replaced
as a complete assembly.
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