Quadrajet 800 cfm

[L92 OLDS]

Qjet is the way to go! I had to replace my Qjet with a Qjet from a Buick LeSabre. Changed the hangers and secondary metering rods to the original 442 rods. The rods from the LeSabre where not as tapered as the 442 rods. You can't beat that deep roaring sound of those vacuum secondaries opening up. Makes me want to trash the idea of EFI swap and slap a Qjet on.

Agreed. Gotta love that Q Jet moan. The LT1 corvette motor in my truck makes the same sound though through the cold air intake.

 

[pontiacgp]

no speed shop around me has the Holley 20-38 throttle stud I need for my quadrajet...

 

[Dinosport]

Nice find. I didn't know q-jets went that high. A thought for my 6.0 swap.

 

[axisg]

Thats a new one on me. I thought they were all riveted on. I even went to check 2 of the spares I have here at work.
Does performance improvements have one in Brampton ? I have to go by anyways to pick up my exhaust gaskets at some point in the near future....

 

[pontiacgp]

I'll do with a bolt and a few nuts until the part comes in locally. Thanks for the offer

 

[MrSony]

Nice find. I didn't know q-jets went that high. A thought for my 6.0 swap.

Qjets are 750cfm or 800. That's not what they flow constantly, thats the max they CAN flow in stock form. Buick used them on 4.1 V6s and 455 big blocks for example. That's why these carbs are so good. They are very versatile WHEN SET UP RIGHT. Can't take a chevy qjet and slap it on a Buick without changing the insides to match the motor. It will run like *ss.

 

[Dinosport]

Qjets are 750cfm or 800. That's not what they flow constantly, thats the max they CAN flow in stock form. Buick used them on 4.1 V6s and 455 big blocks for example. That's why these carbs are so good. They are very versatile WHEN SET UP RIGHT. Can't take a chevy qjet and slap it on a Buick without changing the insides to match the motor. It will run like *ss.

So if I understand correctly q-jets are 750 or 800 cfm. So I can grab pretty much any q-jet and its atleast a 750? So I can even mate one to an LS and it should work good.
If so what made Holley such a big deal?

 

[foxtrot]

So if I understand correctly q-jets are 750 or 800 cfm. So I can grab pretty much any q-jet and its atleast a 750? So I can even mate one to an LS and it should work good.
?

It will 'work' as far as accommodating different flow requirements but would still need to be calibrated for the specific engine that it is utilized on. It can be calibrated for the appropriate A/F ratio that is required. Always best to start with a Qjet from a similar spec'd engine if you are starting with a used Qjet.

 

[axisg]

So if I understand correctly q-jets are 750 or 800 cfm. So I can grab pretty much any q-jet and its atleast a 750? So I can even mate one to an LS and it should work good.
If so what made Holley such a big deal?

Sorry to HiJack GP.

Cant really group Holley in one big lump but they are probably best known for their 4 barrel "double pumper" design ( 2 fuel bowls feeding 4 barrels all the time ). Whereas in the most basic of terms the Qjet runs 2 primary fuel barrels for nominal driving and when things get spirited they utilize a 2 much larger secondary barrels which are engaged via vacuum drawing only as much additional fuel as the engine needs. Can you mate one to an LS ? You wouldn't be the first 🙂

 

[MrSony]

So if I understand correctly q-jets are 750 or 800 cfm. So I can grab pretty much any q-jet and its atleast a 750? So I can even mate one to an LS and it should work good.
If so what made Holley such a big deal?

Yes, you can put a qjet onto an LS, but all it would take is a custom spacer (no spread bore intakes I could find for the LS) and it has been done before. Like they said, you need to have it calibrated to work with the motor. If you get one from an Olds, it won't work well on a Chevy or Buick. You'd have to go through EverydayPerformance (stock type applications are their specialty), SeanMurphyInduction, or QuadraJetPower. These people know their sh*t, but the latter 2 are the best IMO.