Quadrajet Problem Solving > Quadrajet Parts and Numbers

Restamp 7040256 ID

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4speed455:
Cliff, thank you for the advice. I am planning on trying it without the idle bypass first. My air horn does have notches so I am only missing the holes in the main body if I do need it.

Another thing I noticed is the gasket between the main body and baseplate doesn’t match the baseplate(BOP gasket and Chevy baseplate) so I will need to change that, and what gasket should I use between the baseplate and manifold, I see several different styles?

Do you think I will be okay with the .046 idle channel, and what size idle tubes would a stock 7028251 or 7040251 carb use or what do you recommend? What power piston spring will I need?

My plan is to order a rebuild kit from you with the correct gasket, power piston spring, needle and seat and acc pump. Use the .049c primary rods with 70 jets and AU secondary rods, no idle bypass and drill the idle tubes/idle channel if needed.

Does this sound like a good starting point? Anything else I should do or change?

Cliff Ruggles:
I will put the correct gaskets, PP spring and anything else you need in the rebuild kit.  Most likely it will use the early style Chevy main body to baseplate gasket.  They made the change to the later style in 1973.......Cliff

4speed455:
Another piece to the puzzle, it looks like this was a divorced choke carb originally(1968 Olds by my best guess) that has been converted to an integral electric choke. Based off other threads on this site that is possible but difficult. It seems you would need a 70-74 Olds donor carb for the parts then you would need to drill and tap the mounting holes for the choke pull off bracket. Is there anything that need to be done for it to work correctly, I would like to verify everything?

Kenth:
The only Qjets with front inlet and no idle bypass in body would be the 1974 or earlier Buick 350 units.
What is the cast number at the back of bowl and beneith the fuel inlet, also the fine stamped number?
What are the size of secondary POE outlets in air horn at front edge of the air valves and where are are they located, at the edge, high above or under the valves? Pictures if you have.

4speed455:
Cast number at the back of the bowl is 7032551 and under the fuel inlet looks like 11. The stamped number appears to be 35222. Secondary POE outlet are .052 and they are above the air valves. I was told most early Olds did not have the idle bypass in the main body drilled, Is that not what you have found? I have found at least one 7028251 with the same cast number on the main body and it appeared to have the same style baseplate but I could see the cast number in the pictures.

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