Can anyone tell me if this Q-Jet carb is the correct one for my year of car and what size is it please? Here are the details: The car: 72 GS 455 Non-stage 1 Engine and tranny match VIN. The carb: Rochester Quadrajet 7044240 KA 3353 Thanks for the help in advance!
That carb was built on December 31, 1973 for a 1974 model car. Sorry, it doesn't look like it's the original -- nor even the proper replacement. (But, of course, it can be tuned to work just fine on your car.)
Thanks guys! That was a fast response. Disappointing its not the original, but 800cfm will do nicely.
I have a real nice 72 455 carb that may be correct for your car. 7042240 I think is the number. The base plate is missing but yours may work on it. The main body and upper air horn even have the original gold plating on them. I was going to keep it but may part with it. it would need internals like jets etc. and vacuums.
If you consider just the size of the bores, virtually every Quadrajet ever built can flow 750 cfm at the standard pressure drop. There were a few rare models with larger primary bores which were rated at 800 cfm. However, the quadrajets for many applications were limited (optimized, actually) by elongating the stop which controls how far the secondary air valve is allowed to open. This is generally a good thing if the carb stays with its original engine. But if it's transplanted onto a bigger and/or hotter engine, performance can be improved by modifying the stop to allow the secondary air valve to open further.
