General Category > Quadrajet Carb Talk and Tips

Buick qjet

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mcx:
hello...new member as of today!...picked up a clean qjet and need some help from the regulars....carb# 7043240 LA 3562    primary jet 73    primary rod 37    secondary rod CT
secondary hanger L......any Info as to what it's from and if it has the correct jet/rod parts would be appreciated....I believe it's a 800cfm version from the pix in Doug Roes old book(it came with the carb) LOL....thanks. Mike

carmantx:
1973 Buick 455. It is 800 cfm.
Original with 73 jets, 44B primary rods and CT secondary rods.

mcx:
Thanks for verifying...44b?..I guess someone was modifying in its past life LOL....do the codes tell what model of Buick or it's just for any 455 engine?? how about manual vs auto trans?  Thanks, Mike

Cliff Ruggles:
The 1971-74 Buick 455 carbs typically act a little lean on the primary side so it's not uncommon to find either larger jets, smaller metering rods or combination of both in them.

Far easier to free up the APT system and install one of our external APT screws and stick close to the stock jet/metering rod set-up for most applications.

The 7041540, 7041240, 2240, 3240 and 4240's are all auto transmission carburetors....Cliff

mcx:
The installed 37 primary rod was missing a "b" stamp? This means it had the later incorrect style?  would that cause running issues?  Thanks,Mike

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