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View Full Version : Is 750 cfm too much carb for 350?



gospdgo
05-26-2007, 08:21 PM
I have the opportunity to purchase a Holley 750cfm carb for a nice price and I'm wondering if that's too much carb for a stock or very mild built 350? If so, is there anything minor I can do to make sure it's performing at its best?

flynbuick
05-26-2007, 08:26 PM
A 750 Q jet was the stock 350 carb. They are cheap to purchase but great carbs. I would stick with the 750 Q jet rebuilt by one of the buick carb rebuilders.

LARRY70GS
05-26-2007, 08:28 PM
The factory put a 750CFM Q-jet on the 350. What does that tell you? As long as it has vacuum secondarys you should be fine. A double pumper on a completely stock engine might be a bit much.

Nothingface5384
05-26-2007, 09:03 PM
yea take there advice, i wish i would have went with a stock 750 qjet or even an 800cfm one off a 455...i figured i'd be different and go with a 750 speed demon...car doesnt run to well...but i'm taking it to a better shop so hopefully they can get it tuned well..

sean Buick 76
05-26-2007, 09:05 PM
I'm using a 800 cfm Q jet from a 72 455 and it works perfect. John Osborne built to the carb specs, and was a drop on and set idle speed deal. He even had the idle mixture screws set to within 1/4 turn of max vacuum on gauge when I tried to tune it!

Nothingface5384
05-26-2007, 09:10 PM
I'm using a 800 cfm Q jet from a 72 455 and it works perfect. John Osborne built to the carb specs, and was a drop on and set idle speed deal. He even had the idle mixture screws set to within 1/4 turn of max vacuum on gauge when I tried to tune it!

hey sean does john have an account here or even a website?
as if i'm still not happy with my carb after i get it back from the machine shop(goes in tues) i'll be wanting to look him up and swith to a 800cfm qjet..
thanks

SS-TRUCK
05-26-2007, 09:14 PM
I tried an out of the box 850 Q-jet from Summit and it did not feed my 350 as well as my built 800 cfm q-jet . But Yes the 350 will like the carb , just give it some exhaust to help breath .

sean Buick 76
05-27-2007, 02:02 AM
hey sean does john have an account here or even a website?
as if i'm still not happy with my carb after i get it back from the machine shop(goes in tues) i'll be wanting to look him up and swith to a 800cfm qjet..
thanks


There is an attachment in this thread that shows the cost of the rebuild and his contact info is on there:

http://www.v8buick.com/showthread.php?t=123634

65specialconver
05-27-2007, 08:38 AM
i highly recomend osborn,he did mine :TU: bolt on and go!!! remember,its airflow not fuel delivery that matters:Brow:

austingta
05-27-2007, 09:20 AM
I had Jim Weise rebuild mine (for my 68 Riv 430) and he did a great job too... and it was a good bit cheaper too.

Smartin
05-27-2007, 09:38 AM
My JO carb rebuild went just over $250, and he did everything possible, except replating it.

austingta
05-27-2007, 09:58 AM
My JO carb rebuild went just over $250, and he did everything possible, except replating it.

That's about what JW charged me too. I was basing my assumption that JW might be cheaper on the JO bill posted above showing around 350.00 shipped...

Smartin
05-27-2007, 10:20 AM
wow...must've been a next day air thing. I was charged half that for shipping the carb AND distributor.

sean Buick 76
05-27-2007, 01:52 PM
Shipping was to Canada, so thats why its so much...

Smartin
05-27-2007, 02:00 PM
Canadians:spank: :laugh::grin:

sean Buick 76
05-27-2007, 03:12 PM
Ha HA HAA!!! I'm going back in my igloo now.....

gospdgo
05-28-2007, 11:04 AM
The factory put a 750CFM Q-jet on the 350. What does that tell you? As long as it has vacuum secondarys you should be fine. A double pumper on a completely stock engine might be a bit much.

Thanks guys, the Holley I'm purchasing is not the double pumper version. The carb on it currently is an edelbrock 600 cfm, which I thought was to little.

KingSham
05-28-2007, 12:22 PM
What type of carb...does the 1977 Buick Regal(350) have on it?

sean Buick 76
05-28-2007, 05:32 PM
If it is a 4bb it is a Rochester Quadrajet and if its a 2bb its a Rochester 2bb.

Truzi
05-28-2007, 11:55 PM
If the price is good, grab it.

gospdgo
05-29-2007, 10:54 AM
Yea, basically, i'm saving $62 to $72 off retail.

65specialconver
05-29-2007, 12:04 PM
I'm using a 800 cfm Q jet from a 72 455 and it works perfect. John Osborne built to the carb specs, and was a drop on and set idle speed deal. He even had the idle mixture screws set to within 1/4 turn of max vacuum on gauge when I tried to tune it!

when i talked to him he told me he actually bolts them on to a motor & then adjust them to your engine specs:TU: wow,lost art these days.:eek2: sorry JW,i keep forgeting about you even though im on here twice a day:pp next one heads to you:TU:

sean Buick 76
05-29-2007, 04:42 PM
Yeah, I was pretty impressed that he tests them for REAL!!

It was an expensive carb but it is worth it in the throttle response idle quality and fuel millage....

Now I can try all the tricks in the Cliff Ruggles Q jet book to try and make my own FULL RACE Q jet and still have a reliable tuned carb to drop on and drive on the street.

I'm also getting another 800 cfm buick carb rebuilt but this time with modified air bleeds. We'll see how it turns out....