This tool has been selected to fit over the APT (adjustable part throttle) screw in the Quadrajets with internal APT. Burroughs J-7325 set for 1958 Pontiac with tripower $75.00 . The Quadrajet has 1 3/32- or 1 7/32-inch primary throttle bores with either 750 or 800 cfm. Length, Bits, Kit. I am in agreement the the Quadrajet carb is a great bit of engineering, as they went on so many different engines with different displacements. These mixture screws were factory set. It has been proven you can modify the Quadrajet to flow in excess of 1,000 cfm. Some carburetors, such as the Quadrajet found in most GM vehicles, have a special screw and require a specific adjusting tool. Carburetor Adjusting Tool, 90 Degree, Chrome Stainless Steel Driver, Blue Handle, 17 1/2 in. Whatever works. I bought a kit with the proper tool to turn it, and a travel indicator/idle air bleed tool for $4 at Pep Boys (ask for a mixture adjusting kit, listed with the rebuild kits for the carb.) Other carburetors may have a 4 corner idle mix adjustment (4 idle mixture screws). Part Number: MNP-08-0229 Idle Air Bleed This is a worthwhile piece to adjust properly too, especially if you have a lot of mods. Our streetrod had a 350 SBC with a Rochester Quadrajet carb. Burroughs J-7400 set for 1958 Buick with 4GC $30.00 . My engine has a mild cam and 15 in. In a nutshell, Quadrajet carburetors have different barrel sizes for its 2 primaries and 2 secondaries thus the term Quadrajet. of vacuum is about the best that I can do, but it runs very well. I have seen a slick little tool that fits right in the proper spot to adjust. Adjust this in 1/4 turn increments. The Quadrajet uses a Double "D" carburetor adjusting tool. Remove plug from air horn and adjust your part throttle mixture. Order by tool part number. When I first took the carb apart I had to really work to get it out … Carburetor Adjustment Set; 6 of the most common 2 cycle, sma Burroughs J-7292 set for 1958 Pontiac with 2GC $20.00 . I always adjust with a vacuum gauge, but I did adjust for high RPM years ago. These are original tools, most used, but in like-new condition. Just what exactly does this do? Moving the screw down (clockwise) creates a leaner part throttle mixture. Dealing with a 77' q-jet (from a 350 chevy truck and on a 307 now) that has the APT screw located just forward of the main metering piston. Both computer controlled, and non computer carbs. Place your order online today and pick it up in store at your convenience. Doesn't anyone know if that tool … The idle circuit adjustment screws have the ends that look like the blade of a screw driver sticking out. Get product details, choose a store, and get directions. Adjusting a Quadrajet carburetor requires basic knowledge behind the theory and concept of this carburetor. These tools adjust various settings on Rochester QuadraJet, DualJet, & VaraJet carburetors on most GM vehicles having the 3C system.Weight: 3 oz. Applications: 2mm double-D - VaraJet lean authority screw & idle air bleed; & DualJet & QuadraJet mixture control adjusting screw 2.5mm hex - DualJet & QuadraJet TPS adjusting screw 7mm double-D - DualJet & QuadraJet main … Visit our site for coupons and promotions. Shop for Performance Tool Carburetor Adjustment Set Part #: W1185 for your vehicle.
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