General Category > Quadrajet Carb Talk and Tips

67 Qjet partial carb find.

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jamesF:
I picked this up from rusty pile of parts in a guys back yard. Rough. Tag is missing but looks like it is a BOP 67 Quadrajet. No Base Plate.

It has the Idle Compensator cover on the back of the carb with a small springed pin sticking through it. When I removed the cover I found the reed valve type of mechanism in it (pictured). My other 67 Quadrajets have nothing in the that covered recess.
It has a plug in the front top where on my other 67 Qjet's the idle compensator valve is.
Two different approaches. Why the difference?

7037307 airhorn
7033883 Fuel Bowl

Here is some info I found on this:

""A temperature controlled idle vent valve is used on some models (Figure 3). In place of the standard vent valve; a heat sensitive bi-metal strip is used as the valve holder. This is mounted beneath the idle vent valve arm.
The bi-metal strip holds the vent valve on its seat (closed) at temperatures below 75°. When underhood temperatures are above 75° to 85° the bi-metal strip bends upward moving the vent valve off its seat. This lets fuel vapors, caused during hot engine operation, escape from the float chamber. This results in improved hot engine idle and hot starting. At temperatures below 75°, the vent valve remains closed and retains fuel vapors internally to supply extra fuel for good cold engine starting.
During hot engine operation, when the thermostatic vent valve is open, it is necessary to close the valve except at idle to maintain an internally balanced carburetor. This is accomplished through the spring steel vent valve arm which operates off the wire lever on the end of the pump lever. As the throttle valves are opened from the idle position, the vent arm exerts pressure on the bi-metal strip and forces the valve closed. The thermostatic vent valve is adjustable to make sure it closes at the proper time during throttle valve opening from the idle position."

jamesF:
One more pic of the rear.

Ethan1:
 James,
 That looks to me like a '67 Pontiac GTO Ram Air carburetor, just by the casting numbers. It's a long shot, but what jets and metering rods are currently in it? If ORIGINAL, I will be able to tell you what carburetor number you have there.

 Also, for some odd reason, Delco wiped out all known part numbers for these Pontiac carbs, for the key parts. Maybe because they were not available for sale anymore. I don't know. Take care! Ethan

Ethan1:
 Also, what is the part numbers on the primary and secondary flaps, and accelerator pump arm? I assume the reed valve was there to maybe allow air in or extra air in, whereas the plug restricted the air.

jamesF:
Ethan-
Thanks buddy. I'll get more numbers tonight.

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