HS40 valve upper cap?

#1
I was looking in my trusty tecumseh parts book and the 1967 section calls for a valve cap part number 31671? The 1989 version does not? Is this upper cap needed?
 
#2
On these engines IF the valve guide protrudes down into the spring box (breather) area than they do NOT use the upper cap but if the guide is flush with the top or above than it will need/require the upper cap.
 
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