carb suggestions for a 350

[r.booser]

great thanks again guys!

 

[Jims86]

Everyone I have talked to hate quadrajet and it is about 50/50 with edelbrock and holley.

Those people are generally the lazy type(not everyone, so I dont want to hear any ****) and wont bother to learn about the q-jet. Its easier for them to just go to oriellies and plunk down $300 or so for a carb of inferior design.
Q jets, and Holley are best. around 750 cfm is perfect for a 350.
Demons are good, but more for racing IMO.

 

[r.booser]

I'm going with the 600. Picking a brand new one up tonight for $250+ tax.

 

[roving4s]

My qjet seems to be fine, was prob neglected till I got the truck. Drunk some seafoam and she's been running fine. Haven't tried it on hills yet, although I wanna find a carb that can handle inclines and downhill.

 

[r.booser]

Those people are generally the lazy type(not everyone, so I dont want to hear any ****) and wont bother to learn about the q-jet. Its easier for them to just go to oriellies and plunk down $300 or so for a carb of inferior design.
Q jets, and Holley are best. around 750 cfm is perfect for a 350.
Demons are good, but more for racing IMO.

I was told that 750 is too big for my 350 without cams. I can get a holley 750 for $150 right now that the guy took off for a new edelbrock 600.

 

[Stroked]

I was told that 750 is too big for my 350 without cams. I can get a holley 750 for $150 right now that the guy took off for a new edelbrock 600.

Go punch your numbers in here and see what Holley recommends as far as CFM

http://www.holley.com/applications/CarburetorSelector/CarbSelection.asp

 

[Swims350]

the kicker is that most q-jets are like 700 or more cfm even for stock small blocks that is what gets me, I guess it's ok due to the small primaries though.

 

[r.booser]

that is helpful. It is saying 600 is plenty basically for me.

 

[Driver4r]

Swims, Q-jets can flow UP to 850ish, but its vacume controlled, they only flow what the engine wants.

And Jim, Thanks for the support

And 750's will be a little to much for street use, a 650 is MORE then enough. Hell, even my engine im building(the hot 350) they recamend like 650ish for every day, but all out performance is 725. Im putting a 650 Mech secondarie, Double pump on it. Holley 6210 i beleive.

 

[bucket]

It's really hard to over-carb a motor when you are talking vacuum secondary carbs. A 750 would work fine if you find a deal on one, but picking through new ones, yes a 600-650 would be ideal.

 

[Jims86]

I was told that 750 is too big for my 350 without cams. I can get a holley 750 for $150 right now that the guy took off for a new edelbrock 600.

750 is what came on gm 305s, 350's and 454s from the factory. Just have to make sure it's jetted/ rodded correctly.
I would go with that Holley, get a rebuild kit. While your at it, call holley and ask for the recommended jetting size...I think after all is said and done, you will still be under $220 total, and have a great, easy to work on carburetor.

 

[Jims86]

Swims, Q-jets can flow UP to 850ish, but its vacume controlled, they only flow what the engine wants.

And Jim, Thanks for the support

And 750's will be a little to much for street use, a 650 is MORE then enough. Hell, even my engine im building(the hot 350) they recamend like 650ish for every day, but all out performance is 725. Im putting a 650 Mech secondarie, Double pump on it. Holley 6210 i beleive.

Q Jets are mostly 750, but there is an 800cfm model from the late 60's Pontiac, Olds, and Buick muscle cars...pretty rare piece. it can be identified by humps in the primary barrels. 750s are 750s, there is no making them bigger. The big issue with Edelbrocks is the poor bowl design...Hard accelleration, and hard left cornering, and the fuel washes away from the jets...this can be somewhat taken care of with a dremel and skilled hand....but why buy a new carb that has to be modded out of the box to work right?
Most who dont notice the issue, usually have the mixture so fat on the idle side that it compensates for any momentary starvation at the jets. Which is why most. eddy equipped vehicles smoke, and smell like a briggs & stratton.
There is a reason OEMs and NACSCAR used Holley if they used an aftermarket carb.

 

[Jims86]

the kicker is that most q-jets are like 700 or more cfm even for stock small blocks that is what gets me, I guess it's ok due to the small primaries though.

The setting of the vacuum brake on the secondary side is mostly what determins the CFM...Up to 750 wide open....not sure how low it can go, never worried about it. I have seen Q jets on 4.3 v6s in boats though. Maybe they can go down 550 or below.
Very Versital carb, but yes, a little complicated...Hence the learning curve when working on them. Holleys on the other hand, ar simple metering block and jet designs, and the aftermarket support is just phonominal.

 

[Smitch320]

Don't get an Edelbrock. I have one on my 350 and am not really pleased with it.


I am saving up money for a Holley 650 Vac. Secondary w/ elec. choke

 

[gpmorgan]

For a stock or slightly modified 350, I would use the q-jet style carb. For a highly modified 350 I would use a Holley. Here's what I use on mine.

http://www.holley.com/VirtualShow/chevy/silverado/2607.asp