Thread: Need quadrajet help and suggestions

Tweet

Which Holley manifold?............it's been a long time since aftermarkets did not utilize both bolt patterns. In th emean time, without looking at the carb and doing a "hands on" feel for it, I would suggest dropping the float level and make sure the squirter (accel pump) is still getting adequate fuel to give a decent shot at picking up fuel in it's resevoir for proper "shooting". It's not hard to achieve but with a little bit of perseverence, it is not hard, maybe 4-5 minutes of leaning over the grill and tightening your gut muscles. This is not writen in stone, but start the idle mixture screws at 3-1/2 turns from base and tune accordingly (but slowly backing them out. I have a feeling you'll be replacing this carb, but for now you can make this work. One little bugaboo these things have is the gaskets used can somrtimes have extra holes drilled for vacuum use (accessories,etc) and give bad readings to the fuel demand. Please double check power piston travel for smooth operation (the brass piston that holds primary rods). Any other questions, Let me know. There are combinations for primary rod/jet sizes than can really give you a mild headache.

Sean Murphy Induction sells rebuilt Q Jets that are primo. He does all of the shaft bushings, etc. We have bought from him; they ask basic stuff about your engine and when you get the carb, you bolt it on and go. The thing is correct right out of the box.

His web page is

http://www.smicarburetor.com/products/?sfID1=28&sfID2=9

I recommend these boys.

Mike in Tucson

Here is some Q-jet info;
----> http://www.florida4x4.com/tech/quadrajet/qjtshoot.pdf

----> http://www.florida4x4.com/tech/quadrajet

Pat

Thanks for all the replies.

I have ditched this old carburator in favor of a nicely rebuilt on from Jet performance. So far so good, it runs great now.

Still doing a bit of dialing in of the timing and distributor advance, but otherwise looking VERY good.

The main concern with all Q-jets is they warp horizontally (left to right) an can be straightened with patience and a bit of skill.

How? Refacing I suppose?