Is this check valve for (1) of the lines running from the air pump with the Combined thermactor Air bypass/Air diverter valves?
EDIT: One check valve runs from the head to the combined Air Diverter/Bypass valve and the other check valve runs to the catalytic converter. The upper valve is larger, at least it is on my '92 302, Supercab.
1992 F-150 I6 4.9L 300 110K 4x4, SuperCab, Manual
1992 F-150 V8 302 156K 4x4, SuperCab, Auto
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