The quardajet is a very misunderstood carb. My father who is now 85 and spent his life as a professional mechanic working in GM dealerships for years as well as farming all of his life taught me the ins and outs of QJets 30 years ago. They are one of the best carb designs ever made when you learn them in detail. They survived decades with minor design changes all the way into the mid 80's with the addition of a few electrical components such as TPS for the computers until the government emissions controls exceeded what could be done with them. How many carb designs can say that and the later Qjets were a 850 CFM carb. I recently dropped a mild performance cam in my 75' Hurst Olds 350, ported the heads and manifolds, dualed the exhaust and modified a stock QJet to handle the air/fuel/vacuum requirements of the new configuration. Had a guy tell me what I really needed to do to finish it off right was drop on new Edelbrock 650 CFM in there to really open her up. When I pointed out I would be going from an 850 to a 650 CFM carb and lose the stock appearance of the engine - I got the deer in the headlight look.
Bztguy, I'm going to have to send you a PM, you just might have the knowledge to answer my question on adjustments for a Quadrajet 4 bbl.
John
