Quote:
Originally Posted by 4RSS FED
Thanks Steve. It is a C3 Corvette manual headlight/wiper door vacuum override switch. Yes it is a valve with a plunger used to switch vacuum on or off. Non NPP production car.
From Post #1

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Hello, (Forgive my bad english)
Thank you for this very useful Thread, i'm about to receive my ZL1 used Mufflers, and i got as well a C3 Corvette Vacuum switch.
One question, few posts ago someone was talking about hissing noises probably related to a wrong port hook up on the switch (inverted).
Can you suggest me what port use as vacuum input and what to the mufflers on the switch? (white or blue) Thanks,
Alessio