General Category > Quadrajet Carb Talk and Tips

Buick qjet

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mcx:
I finally got your book in the mail today and its excellent...and it actually has a pix of the same  QJET I'm overhauling(rated second desirable) LOL...i keep rereading the section on air  bleeds (top/bottom,airhorn) and look at pixs to see which is what is on mine....it's actually unfortunate the book came today, yesterday I pulled the secondary well tubes and modified as shown in the Doug Roe book drilling those multiple tiny holes, as used on the Ford Cobrajets!!!  I read in your book DO  NOT DRILL THOSE HOLES,...at least they can be pulled out easy and replaced....it's a shame, they looked like the real ones.

Cliff Ruggles:
The Ford CJ units were the only factory Q-jets to use that modification.

If you are using secondary POE (all models didn't use it) adding holes to the tubes will have them start sucking air instead of fuel pretty quickly unless you have some HUGE holes leading to the wells to the fuel level high enough.

We have Q-jets on foot braked applications well into the 9's over 135MPH and do NOT use drilled tubes in them, and have never observed any improvement from doing it.

For the big Buick Q-jets do NOT modify any of the airbleeds, idle or main, they don't need it. 

They will need idle tube, DCR's, and bypass air modifications based on the application, and different jets/metering rods.  We can help out with that even without the working APT, and supply the correct high performance parts to rebuild it as well.......Cliff

mcx:
Cliff...thanks for sharing about not touching idle/main bleeds....I also drill  opened up the secondary air bleed tube restriction, that is shown in the Roe book...it's where you drill out the large secondary plugs and open up that channel and than flip the main body and open up the connecting channel,it's a restrictive dog leg bend...was this worth doing in your opinion?
...your book was spot on with the lower gasket locating bumps cracking off easily with my cave man disassembly....i had to mix some epoxy and use the gasket as a temporary mold to reform the two bumps, it worked decent with some file work...almost looks stock LOL

Cliff Ruggles:
Unless the plugs are leaking leave them alone.  Nothing waiting for you opening the passages under them.....Cliff

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