It’s hard to believe, but the week is already nearing completion. That means Thursday has landed at our garage door. With the end of the week nearing, are you making weekend garage plans, or have they already been made? If your plans for enjoying some garage time with your project include working on that old Quadrajet sitting on the shelf, you might want to check this out.

Carburetors built before mid-1968, have a tag with the part number. In late 1968, the seven-digit part number was stamped vertically onto the main housing

In this edition of Throwback Thursday, we’re taking a leap back to April 2016, to check out: Choose Your Quadrajet: Number Identification Guide. Not many people consider the Rochester Quadrajet a performance carburetor. But in reality, it was placed on many of the performance vehicles Chevrolet built from the ’60s until the late ’70s – as well as some Chrysler products. Still, it still does not get the respect it deserves. When talking to guys about restorations however, it is highly regarded as the go-to carburetor.

Since there are many variations of the maligned carburetor and each one has a different factory application, we decided that the original article would be beneficial for when you are scouring the swap meet or local junkyard for the correct unit for your car. Heck, you might even have one on your shelf that has an unknown background you would like to clear up.

All Quadrajet fuel inlets are in one of two positions. Carburetors intended for Chevrolet, Cadillac, Buick (’67 only), and GMC applications, utilize a fuel inlet that enters the carburetor at a 90-degree angle, facing the passenger’s side of the engine. Buick (’68 and newer), Oldsmobile, and Pontiac castings utilize a fuel inlet that is pointing toward the front of the car.

Few people still fail to realize the Quadrajet has a strong racing heritage within the Stock and Super Stock drag racing classes. In fact, there have been a multitude of record-holding Super Stock race cars that have run in the 9-second bracket with a Quadrajet on top of their manifolds.

Even if you’re not a fan of the Q-jet, as confusing as identifying these fuel squirters can be, I thought, Choose Your Quadrajet: Number Identification Guide, was a great choice for this week’s Throwback article.