QJet to Holley Help

[Longroof79]

My friend 3 hrs south of me told me his neighbor had his Q-jet redone by Guaranteed Carburetor and he is extremely happy with the way the car runs. It was ready to bolt on and go.

 

[pontiacgp]

Greetings Lelanb & all; You don't need my .02 cents, but here it comes. I'm a Holley guy through & through, buy a 1971 Q-Jet from one of the recommended sources or rebuild yours. Holley's only have a a couple of advantages over a Q-jet, at full on they atomize fuel better & at low engine speeds not as well. And an adapter take that small advantage away. The other advantage is they are less complexed & a little easer to tune. As the front primary rod spring on a Q-jet has to work in unison with the cam vacuum single, that's the tough part of working with a Q-jet. Now the down side of a Holley, if it's too big or tuned poorly when you go to Hammer down the car will fall on it's NOSE, you won't be happy. Take a look at my custom Holley-Proform-Quick Fuel carb & note that it is a vacuum unit. With a heavy car (say 3500 Lbs) & tall rear gear you don't want that secondary opening until the engine is ready, hence NO flat (or no you nose) spot. Sell the Holley or save it for the future when have the correct intake & enough engine & gear to require a Holley. Happy New Year, Bob Jr.

You cannot finely tune a Holley like you can with a Quadrajet. Quadrajets are more complex to tune but well worth the effort to learn cause you'll never get a Holley to run like a Quadrajet.

 

[lelanb]

alright i finally got rid of the holley and im ready to purchase the qjet, but my cutlass was originally a v6 and my wiring diagram says it had a choke relay or whatever. it currently has a sbc 350 which i believe came out of a 1980 k20 and the current qjet is hot air choke with another type of vacuum thing on the back, should i purchasing a hot air choke or electric one? and do i need the vacuum thing on the back? you know what itll just be easier for me to attach pics...

^^this one looks just like mine except without the second vacuum reservoir on the back

^^ this looks exactly like my current carburetor and i feel like maybe i should stick with this one

sorry for the long post but i really dont want to mess this up!!!

also i have an egr valve if that helps any, but im missing the canister that sits across from the battery in the engine bay, im missing the vacuum ball, i have a capped vacuum hose coming from the very front of the intake by the water hoses, i have a capped fast idle solenoid too but there isnt anywhere left to plug that vacuum into unless it goes to the capped manifold, theres also a capped vacuum hose on the back of the intake manifold but theres a t there and the other goes to the transmission and in addition to my pcv valve, there is another hose coming out of the other valve cover that leads no where at all, its just cut.

could you guys please help my figure out where all these vacuum hoses are supposed to go, any help and/or pics is greatly appreciated.