Quadrajet Build Thread

[olds307 and 403]

Ok, a bunch more accomplished. I drilled out the idle channel restrictions and the main bleeds with a 1/16" bit, both were tiny. The 1/16" equals a .059", about what Cliff's recipe recommends. I staked the check ball, took a few tries to get it to seal. I installed Cliff's custom 44 primary rods, new power piston collar and black power piston spring, which isn't set in stone. Main housing tapped and the 73 jets installed. Power spring and stop installed 9.5 turns from seated. Biggest screwdriver to install the .135" seat. I also changed air flap cam, spring and notched to help prevent a bog due to the secondary exit holes being above the flaps.

 

[olds307 and 403]

Ok, the float was way off, bent and crimped enough it would not fit the housing and sat too high. So I set the float to 1/4", a starting point Cliff recommends for high performance builds. I checked it flipped upside down and with tension on the float right side up. It is easy to over leverage the float in the right side up positiion. The float Cliff provides is smaller than the one that was in the carb, a good thing. I kept the second lightest power piston spring as a starting point. Cliff's accelerator pump is shorter, has the inner cup spring and is ethanol resistant. The accelerator rod with the little clip makes removing the top much easier with the carb on the motor. New fasteners and lock washers included in the kit is a nice touch. The passages are blocked in the hot air housing allowing the conversion to electric choke. It also has his fast rate pull off, I just put one on the other Qjet Everyday Performance custom tuned for me. I just need to check the secondary air door opening and pick the secondary hanger and rods from my assortment as a starting point and this carb is done. This carb will get tuned with the recommended wide band from Cutlassefi on the new motor.

 

[g0thiac]

Ok, the float was way off, bent and crimped enough it would not fit the housing and sat too high. So I set the float to 1/4", a starting point Cliff recommends for high performance builds. I checked it flipped upside down and with tension on the float right side up. It is easy to over leverage the float in the right side up positiion. The float Cliff provides is smaller than the one that was in the carb, a good thing. I kept the second lightest power piston spring as a starting point. Cliff's accelerator pump is shorter, has the inner cup spring and is ethanol resistant. The accelerator rod with the little clip makes removing the top much easier with the carb on the motor. New fasteners and lock washers included in the kit is a nice touch. The passages are blocked in the hot air housing allowing the conversion to electric choke. It also has his fast rate pull off, I just put one on the other Qjet Everyday Performance custom tuned for me. I just need to check the secondary air door opening and pick the secondary hanger and rods from my assortment as a starting point and this carb is done. This carb will get tuned with the recommended wide band from Cutlassefi on the new motor.View attachment 173564View attachment 173565View attachment 173566View attachment 173567View attachment 173568View attachment 173569View attachment 173570View attachment 173571View attachment 173572View attachment 173573View attachment 173574View attachment 173575View attachment 173576View attachment 173577View attachment 173578

Nice, would be interesting to know your results after putting it back on.

 

[olds307 and 403]

Nice, would be interesting to know your results after putting it back on.

I will definitely update at that time, unfortunately it won't be till next spring.

 

[olds307 and 403]

Air door set to 1.300. Edelbrock claimed 850 cfm with a 1.27 opening on their RPM Qjet. Cliff suggested up 1.300, he has 1.310" on his 650 hp Pontiac. I put a H hanger and CK rods to start. I have 71, extra 73 jets which are questionable and 74 primary jets. I have B, H, I, J, K, L, M and P hangers. I have CC, CE, DA, CK, CV and AY Secondary rods. It should be ready for the new motor.

 

[olds307 and 403]

Cliff's wording on the secondary air flap adjustment is confusing and contradicting in his book. The smaller the measurement, the more open it is FYI. He claims Edelbrock's 1.270", 850 cfm measurement should be the max opening yet he has a 1.240" to 1.300" measurement for his highest performance 3rd recipe. I think the 1.270" is where I am going to adjust mine too. Our Olds V8 seem to love larger CFM.

 

[Burd]

There’s a guy in Ohio that is great at rebuilding or just selling you the rite stuff. Make sure you get the parts for alcohol

Cliffs High Performance Quadrajets – Quadrajet Rebuild Kits, Cabruretor Parts, Quadrajet Rebuilding, Quadrajet Parts, Bushing Kits, Carb Tuning

 

[olds307 and 403]

Yeah, I bought my rebuild kit from Cliff, very complete with extras. He is the "Cliff" I have been mentioning😉

 

[olds307 and 403]

I bought some CE secondary rods, the missing link from the choke pull off to the secondary air door and a vacuum cap assortment from Quadrajet Parts. It will be ready to go.

 

[liquidh8]

Love Q-jet's, Ran them, rebuilding using that book, till I went to EFI. I spent years picking q-jets from the junkyards for extra parts.