Pete, which Qjet do u plan to use? I may have a good core. I have a couple with the choke removed too - one is my rebuilt spare/never used - and with will work on any intake (but has no choke of course). I have some others cores too and know a good shop for rebuilds.

Send a PM if i can help ya,
cardo0

 

Thanks cardo, PM sent.

 

Lemans Pete:
Holleys do fit, you just have the wrong series carb. I have the stock L-46 air cleaner on an old 3310-1 Holley which is a 4150 series versus the 4165 series. The difference is the float bowl design. The 4165 series has side hung floats the 4150 has center hung floats. If you look at your air cleaner you will see the upward projection in the front and back which were put there to clear the float adjustment on the 4150.

 

Get a hold of Cliff Ruggles.
He's on here. He literally wrote the book on Qjets and making them perform.

 

Mine was doing it when it was parked, and since it didn't have externally adjustable floats it was a real PITA to try and stop it via float adjustment. I tried everything to get it to stop with no luck and finally gave up. I really like Holley carbs for their ease of tunability, etc., but a lot of that seems lost on the 4165/4175 since it's a single feed carb and you have to open it up to adjust the floats. IMO Holley could have made that car a lot more useful by putting adjustable floats and a dual-feed inlet setup on it...

 

holley 670 street avenger has my vote

 

Holley spreadbore are not easy to tune and based on a quadrajet which makes them junk in the first place.

 

"Cliff" is surely a good Q-Jet guy, and probably a good idea getting a hold of Lars Grimsrud in CO, at v8fastcars@msn.com. He'll send you his Q-Jet papers, with tons of information. Q-Jet haters have always been alive and well, but I'm certainly not one of them. Thinkin' you're best at fixing up the carb you already have, then maybe a Q-Jet for the street. Get with Lars on this, as not a big fan on commercially rebuillt carbs.

 

Check these folks out.

http://customrebuiltcarbs.com/index.shtml

 

Isnt the 4150 design a square bore?

 

Always had good luck with Summitt; not not much with Jegs; Talk to the technical staff at Summit they can tell you if new carb will fit.

 

Pete, you're right, the 4150 is a squarebore carb. Again, the marketing schtick on the 4165 isn't entirely forthcoming...it fits the spreadbore hole pattern and has the fuel inlet moved to the same location as a QJet but the similarity ends there. You need a different air cleaner base than your stock one along with a 1" shorter filter element and the vacuum tap on the back of the manifold has to be modified as well, though it sounds as if yours may have been already modified to make it work.

The only ways that a 4165 is really superior to a QJet are in the increased bowl capacity and available 'double-pumper' cofiguration. It's not really much easier to work on than a QJet because the transfer tube is always a headache to deal with when putting it back together, and they have that damnable leaking secondary booster issue which I have heard of from a number of guys on this forum and have dealt with myself.

Personally my own issue with QJets is that (like a lot of carburetors) they don't do well when they sit idle for extended periods and the airhorn very easily warps when they are the very least bit overtorqued, causing all sorts of issues. They're also ugly. But when they are working right they do work very well.

I would say that if you want to go with a maintainable, understandable carb then get the 4150 and buy an inexpensive low-rise aftermarket intake to bolt it onto. You will sacrifice a little bit of low-rpm economy but it will fit under your air cleaner base and they are modular and very easy to tune-set the floats, set the idle, choose the right power valve, and jet from there. If you just absolutely have to get it running right with stock equipment then a QJet is the way to go but if you're not good at rebuilding them yourself (I know I'm not!!) you'll have to depend on a REPUTABLE rebuilder and those guys are getting rare.

Hopefully I've addressed the biggies in this post...my previous posts on this thread were done under duress (work) but I had a little free tiume to give you a proper answer today so there...hopefully you get this sorted out and get your Vette running like it should.

 

...and you can't even retro fit fuel bowls, because the accelerator circuit doesn't line up! Who's idea was that?


Keep the shiny side up!
Scott

 

Will the 670 fit under a stock air cleaner base?