Rochester Quadrajet Carb Number Locations
Quadrajets built in 1968 or later have the carburetor number stamped on the driver's side above the secondary throttle shaft on the float bowl. From 1965 to 1967 the carb number was on an round aluminum 'bottle cap' on the left side of the float bowl near the front. This tag is often missing, making identification more difficult.
1968-up Quadrajet Number
The Rochester carburetor number is on the first line. The first item on the second line is the build date code, and the last item is the assembly line code.
- 17056211: The 4th to last digit is the year, so 1976.
- 2615: Day 261 of 1975, so Thursday, September 18, 1975.
- ADF: The line code.
This carb is from a 1976 Corvette 350, High Performance, Federal emission, M/T
Other Rochester Carb Number Locations
1967 and earlier carbs usually have a tag only.
Rochester Monojet carbs are also stamped on the side of the float bowl.
Dualjet 2 barrel carbs are usually stamped on the rear of the float bowl.
Numerical indexes
Once you have the carburetor number, you can look up the basic parts in the numerical index, which also links to a page with a comprehensive parts listing for each Carter carburetor number: