Okay so I have this carb I want to put on my 73 gs but it has this vacuum port or something in the very front. What is it for? The air cleaner wont fit because its to tall. Can I just cut it off or unbolt and make small flat plate with a couple small holds drilled in it? When I got this carb a last year it was brand new in the box. Its currently on another engine to keep debris out.
It looks like the first version of the APT (adjustable part throttle) feature for Quadrajet, 1975 I think. You'll have to work around it if you want to use that carburetor. Devon
Looks like a fuel bowl vent... I'd cut the air cleaner to fit or.... buy one from a board member that fits:TU:
Same carbis in Cliffs book page 41 and 46 books states its between it was used between 71 and 74. Hey what are the numbers on the carb?
Not sure what the part number is. The guy I got it from, bought it for his 73 trans am with a 455. He decided to rebuilt his original carb.
Don't carve up a GS air cleaner to make it work, but if you can make an aftermarket air cleaner fit, then go for it. Devon
Better check the numbers before you screw with it too much. There are a few Pontiac carbs out there that run a very pretty penny. You may be able to swap that for a Buick one and get some cash in your pocket at the same time.
Factory Pontiac Q-jet, and an excellent unit. DO NOT cut the vent, or remove or block it. It must have a corresponding hole in the air cleaner base and extend inside the filtered area just inside the air cleaner element. You can NOT replace that airhorn with one from another make or model, they are specific to those units, having an adjustable upper main airbleed screw, and upper idle airbleeds in the airhorn. Other models from that period, Chevy, Old's, etc, will have the upper idle airbleeds in the main casting. Those early 70's Pontiac units have an EXCELLENT secondary POE system, and no venting in the airhorn aside from the front vent (great for drag racing and cars that leave really hard)......Cliff
