General Category > Quadrajet Carb Talk and Tips

Strange Secondary Air Valve

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Shark Racer:
I can't help but wonder if it's a "performance mod" meant to even out cylinder distribution.

Ethan1:

--- Quote from: Shark Racer on July 31, 2013, 09:38:35 PM ---I can't help but wonder if it's a "performance mod" meant to even out cylinder distribution.

--- End quote ---

 Could be, Steve. Makes sense.

Novarolla05:
That's kinda what I figured as well. With the air valve open all the way, the extra flap is right in front of the fuel nozzles. I was thinking it might be to help direct the fuel more downward. Since it seems pretty unique/rare, I guess its safe to assume it didn't make much difference in performance.

I wonder if JET Performance or some other company that does rebuilds made their own custom flaps. Still doesn't explain why there was only one like it though.

Richie

Shark Racer:
A notch in front of the fuel discharge holes will help more than anything, look at Cliff's book or poke around the net for pictures of some of the "High Output" Pontiac Quadrajets and you'll see what the factory offered.

Novarolla05:
I agree Shark Racer, I've done the notching mod, and it definitely improved the transition to the secondaries when I mash the go pedal. I guess for now this flap will remain a mystery.

Thank you both for all your input!

Richie

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