General Category > Quadrajet Carb Talk and Tips
TV cable to early Quadrajet
JLBIII:
Hi Cliff
The carb part number is 7041540. It has a Pontiac primary throttle shaft with bolt-on linkage installed.
Do you know what the correct distance for a pickup point should be?
I have the bolt on linkage from the original carb 7028264 that I could use but would prefer to modify a replacement piece. Still looking for one. Thanks
tayto:
here you go
old cars:
"If it is a 1971-74 Buick 850cfm carb (folks call them 800's all the time) "
Can you explain what makes these 850 cfm
Cliff Ruggles:
Good question.
The 71-74 Buick 455 carbs and the 73-74 Pontiac Super Duty 455 carbs have the same EXACT size as the Edelbrock 1910 and the secondary airflap stop is ground down in the same fashion to provide full opening of the air flaps.
They flow 849cfm
The 1971 Pontiac 455 HO carbs flow 827cfm.
The smaller castings all flow 750cfm, unless they have a longer stop on the air flap shaft. An example of this is the 1968 Pontiac Firebird carbs. They reduced cfm slightly in two ways on those, the linkage that opens the secondary throttle plates has a "step" in it to reduce the open angle and the secondary airflap shaft has a long stop on it to kill off some more cfm.
Tech tips of the week.......Cliff
JLBIII:
Thanks Cliff and everyone who replied!
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