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Carby size?

 
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David
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Posted: Sat Jun 26, 2021 8:38 pm    Post subject: Carby size?

I've just bought a project car that has a 350 chev in it but it has no carb, I was wondering what would be an appropriate sized carb. I have no idea what has been done to the motor but I would imagine it is basically stock and will be left stock as it is in an anglia and it's my first v8.
Any help would be appreciated.
Dave.
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Big G
Just Idling



Joined: 11 Aug 2020
Posts: 101
Location: Sunbury

Posted: Sat Jun 26, 2021 11:18 pm    Post subject:

Not being that familiar with Chevs, I guess you would haver a 4 barrell manifold? Then a 600cfm Holley or similar would be as small as you want to go
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david
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Posted: Sat Jun 26, 2021 11:25 pm    Post subject:

Yeah, sorry it's a 4 barrel manifold.
Dave.
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Mick Kelly
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Joined: 10 Jun 2021
Posts: 64
Location: Elmore (between Echuca and Bendigo)

Posted: Sun Jun 27, 2021 4:37 am    Post subject: Carby size ?

For the street, your best bet would be a "Rochester Quadrajet".
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a25Chevrod
Just Idling



Joined: 15 Sep 2020
Posts: 125
Location: Gympie, Queensland

Posted: Sun Jun 27, 2021 6:14 am    Post subject:

I was going to suggest a 600 Holley or even a 465 would do the job if you dont want to do max revs.

But when Mick Kelly wrote
Quote:
For the street, your best bet would be a "Rochester Quadrajet".
, I realised that evidently you must have a job where you do a lot of bookwork because Quadrajets make great paperweights.

More moving parts than the Space Shuttle and not much better track record

Stick with the Holley, easy to set up, fix and get bits for

a25Chevrod
I enjoy anything that turns $$$$$$$$into noise


Last edited by a25Chevrod on Sun Jun 27, 2021 6:21 am, edited 1 time in total
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a25Chevrod
Just Idling



Joined: 15 Sep 2020
Posts: 125
Location: Gympie, Queensland

Posted: Sun Jun 27, 2021 6:20 am    Post subject:

Oh by the way , if you beleive the formulas

To get a 350 ci engine to rev to a 6000 red line with a maximum volumetric efficency of 80% you need around 483 cfm going in to do it



a25Chevrod


I love anything that turns $$$$$$$$$$ into noise
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David
Guest





Posted: Sun Jun 27, 2021 1:48 pm    Post subject:

I will be setting it up for reliability and economy (if there is such a thing with a v8;) as i want to drive it regularly and I dont think it will need the extra revs on the street.

At this stage I just want to get it running to see if it needs a rebuild, just so I know what to budget for.
Thanks for the help.
Dave.
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spark
Cruisin



Joined: 13 Jun 2021
Posts: 313
Location: Lakes Entrance Victoria, Australia

Posted: Mon Jun 28, 2021 12:06 pm    Post subject:

Maybe a second hand Carter 600CFM for $200 could be a start or S/H Holly 600CFM for $150- heres a link- (They are in Queensland and do mail order)

http://www.californiaspeedsupplies.com.au/carburettors.htm
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Drewfus
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Joined: 14 Jun 2021
Posts: 48
Location: Newcastle, Australia

Posted: Mon Jun 28, 2021 12:35 pm    Post subject:

As mentioned above, a 600cfm Holley, Vac secondaries.

Cheers,

Drewfus
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Mr Cool
900RPM



Joined: 27 Sep 2020
Posts: 907
Location: Bacchus Marsh, Vic

Posted: Mon Jun 28, 2021 2:16 pm    Post subject:

There is a basic formula for working out carby size.
Carby = Engine capacity x maximum RPM divided by 3456.
So, assuming maximum RPM of 6000 is required, carby = 350x6000/3456 = 607cfm.
Therefore as mentioned above, a 600 cfm carby will be fine.
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David
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Joined: 27 Jun 2021
Posts: 20
Location: Brisbane, Queensland, Australia

Posted: Mon Jun 28, 2021 6:38 pm    Post subject:

Thanks for the info guys, I just have no idea about these engines as I have only worked on 4's + 6's in the past. I think I need to find a good book on them.
Dave.
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Fingers
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Joined: 04 Sep 2020
Posts: 85
Location: WAGGA WAGGA NSW AUSTRALIA

Posted: Mon Jun 28, 2021 11:12 pm    Post subject:

I am suprised by Choco's lack of response to this thread.
I was expecting something like "It doesnt matter what size carb you have, leave it on the shelf, 'cause you need to put EFI on that thing!"
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choco
800RPM



Joined: 11 Jun 2021
Posts: 805
Location: Queanbeyan, NSW (on the ACT border)

Posted: Tue Jun 29, 2021 7:44 am    Post subject:

Fingers wrote:
I am suprised by Choco's lack of response to this thread.
I was expecting something like "It doesnt matter what size carb you have, leave it on the shelf, 'cause you need to put EFI on that thing!"


Why should I bother when you guys do my dirty work for me? My sig says it all.....
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Carburettors SUCK!
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Pep
900RPM



Joined: 14 Jun 2021
Posts: 949
Location: Georges Hall, NSW

Posted: Tue Jun 29, 2021 2:42 pm    Post subject:

As most said...a 600 holley spread bore with vac secondaries would be a good size....You will have to get the right main jet size...I'd say low 60s will be about right. Being a light car you will only need a smallish accellerator pump cam and squirter.....Geez...I just may have one of those 600s in my garage that I may want to part with......( shuddup guys...Chocos keeping quiet so we can shift this stuff... )
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Mick Kelly
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Joined: 10 Jun 2021
Posts: 64
Location: Elmore (between Echuca and Bendigo)

Posted: Tue Jun 29, 2021 7:52 pm    Post subject: carby size?

The only paperwork I am involved in is filling out my log book.
I drive a "B double" for a living.

As far as "Rochester Quadrajets" being only good for paperweights, I guess that is a matter of personal opinion.

My experience with the "Rochester Quadrajet" was a good one.
I used to have a 1964 Chev Belaire with a 350 chev out of a Z28 Camaro.
I used the "Rochester Quadrajet" I never had any problems with this carby.

It didn't need to be tuned as much as some of the other carbys suggested.
Virtually set and forget.
The 1964 Chev Belair was a heavy car yet if driven sensibly I got approx 23 miles per gallon. When the secondaries opened up the accelleration was incredible. I found it to be a cheap, reliable carby.

Other makes of carby may be better but for the street I think the "Rochester" is the way to go.
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