General Category > Quadrajet Carb Talk and Tips

70-74 Cadillac Qjets

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mcx:
Cliff...I didnt read any mention in your book(excellent) about the early 70s Qjets on the huge Caddy motors...those were 472 to 500ci behemoths....are they a decent starting point simiilar to the same era Buicks qjet???  Thx, Mike

Cliff Ruggles:
No, the Caddy carbs thru 1974 are the smaller castings and still used the early hinge pin and float arrangement same as the Olds carbs thru 1974.

In and after 1975 they used the later design and larger castings, same as Olds, Pontiac and Buick did until 1980.......Cliff

mcx:
Cliff , thanks again..so it's a standard 750cfm design and less desirable float(damn)..my neighbor offered it up,  it has the thicker air horn for the primary POE and no one has fussed with the APT  plug in the base plate....I was hoping those features can be swapped onto my Buick 800 qjet,  if everything matches up....time to disassemble it and see.

Cliff Ruggles:
The early float arrangement is OK, but I don't use or recommend using it for "big" power.  Fine for most street cars to at least 450hp without much trouble.......Cliff

mcx:
Cliff...this Caddy Qjet has notched out sections on the secondary air flaps but not in the location usually seen on Pontiac versions...it's not by the POE holes
 but  on the rear towards outside....what was the purpose for this location?

...I was also looking over the idle air bypass path and its differant from side to side?..one side has the air horn cut out and the other side has a drilled hole in the main body.

...I see what you mean about the  early style float pivot, much differant than the Buick.

....I tried reading the primary jets size but its stamping is impossible  ...the primary rods are 41B...I forgot to write down the secondary rods  but they are skinnier than what is in the Buick.

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