Ok guys, I just had my original quad rebuilt and installed it replacing a model 2010 Holley for only 1 reason. I have an Edelbrock low high rise intake and the Holley got out of the hole great, redline all four, but no elec. choke kit will fit, and old heat rise choke won't line up. The Quad runs OK on 2 bls. but when I kick her down to 4 she dogs bigtime. My question. If I get my orig. Quad dialed in will it kick as hard as say Holley or Edelbrock. Keeping her original has long gone as I have one size over cam and she's a bored out 350/270, Headers, etc. Let me know what your running for fuel delivery. Floyd Popper

Hi Floyd,

I would think that if you can get that Edelbrock dialed in just as good as the Holley you should get the same performance. However, how long will that take and how difficult will it be. The strong suit of the Holley carbs is that they are easy to tune to each specific application in that it is easy to experiment with the critical components. I'm not that familiar with Edelbrocks but my thinking here is that if it takes 3 times longer to change a setting than it would have on the Holley, it may take a long time to get that car dialed in again.

I suggest calling Edelbrock to see if they can recommend adjustments based on how your engine is built and what cam (I suspect the prob. you describe is because of your intake vacumn which is related to your cam) you are sporting. Also, finding someone in your area that is experienced in tuning performance chevys may be well worth the money. Its either that or forego the electric choke.

Best of luck either way!

I just bought a Edel Performer 750 mech. to replace my 750 Holley mech. I love it, very smooth and no bogging, I agree with the above statements that you should contact Edel. and then get it dialed in to your reqt's. They come from the factory jetted for economy vs performance but mine is running great right out of the box.

Nearly every Quadrajet I have had worked very well. No bogs, stumbles or anything else. The problems usually come from people messing with them trying to "tune" them and they end up making things worse. I purchased a Holly Street Dominator intake, and a Performer carb for the last Camaro I had, '79 Z28 350/auto, Crane Fireball, headers, full duals and a 3:42 gear, but never got around to installing them. The Quadrajet ran so well, that it was like "I'll get to it next weekend". I ended up trading the car before "next weekend" ever came. I'm sure they would have made a difference, but the car ran so well that it never seemed to be a priority to get the new stuff on. Everyone who drove it told me they were suprised at how hard it pulled out of the whole. I never did anything to the Quad except change the fuel filter.
If you are after all out performance, you may want to look else where, but if you can find someone who really know about Rochesters, you should be able to get very respectable street performance from it. I guess they are about the hardest to get dialed in of the three you mentioned.
Ever consinder a Demon carb?
The quad on my '76 has been previously "tweaked" and doesn't run right, and I have considered trying a Road Demon.

The quadrajet is a great carb, and since it was recently rebuilt, it sounds like a simple adjustment of the air door is all you need, it's probably opening too fast. The spring adjustment is near the top on the passenger side with a setscrew from the bottom locking it (use a mirror). You want to tighten it to about 1-1/2 turns from zero tension on the door. Sometimes people overtighten the spring and break it, so be careful. Joe