Technical Period correct carburetor? Help wanted. Thank you.

Hi i'm searching for my mild 327 chevy engine a periodic correct carburator. 600cfm.
I would like to use a Holley 1450/1460 or Rochester 4GC.
Any advice how to find out what would be periodic correct?
I know the "list number lists" but none of these tells me which one was in wich year on wich car.

 

the Holley master catalog cross references the list number and shows year make and model of car which corresponds .

 

@97
Thanks. You mean the actual catalogue or an old one? Would it be available online as a pdf? I asked goggle but without result.

 

Always lots available on eBay.

Gary

 

The 4GC id number was on a separate metal tag. Finding a nice, original tag might be a problem.
There were basically two sizes on 283's .Almost have to measure venturis to sort them out.
Later 327/250's and PP 283's had the larger one.
Filter nub on top, plus Chevy type large loop for grommet on linkage...close enough, I would say.

 

Steffen, you might consider the 1850 Holley, it is 600cfm and most versions of it will look period correct. Originally used on a Ford product under List No. 1850 some details were changed when it became popular in the aftermarket. I don't know when but the throttle arm was changed to the Chevrolet style, but even more noticeable are the plastic manual choke ***embly and top cover on the vacuum secondary actuator. Some of the 1850-3's came with the plastic parts, but I don't know if they still do.

 

I believe the 1st 327 to get a Holley was the 1964 solid lifter 365hp, model 2818 rated at 570 cfm- 585cfm. The aftermarket 600 vacuum model looks identical, but you will definitely get a better seat of the pants "kick" from a mechanical secondary version

IMG_3748 by bowie posted Aug 1, 2014 at 6:58 PM

 

Didn't the early 327 with 2 fours have WCFB's?

 

yes. I think the earliest 2x4 283s had different carbs than that but they ended up all using the WCFBs.

The L-79 came with a 700 cfm Holley, factory period correct depends on what engine it is.

 

No early 327 2x4's
Found on a few 265's , and 283's , 245 and 270 hp.
Also on Mopars, Caddys, 56 Pontiacs..more still
Corvette single carbs seemed to be more WCFB's , where everything else had more 4GC's.

 

L 79 had a 585 Holley.
1968 L 79, 750 Q-Jet

 

The plot thickens, actually.

 

in 1966 you could get a holley 585 cfm carb,or the smaller q jet on a 275 hp 327.The q jet flowed around 635 cfm I think,and was the better carb.The 4gc Rochester carb used on the 64,65 220 hp 283,and the 250 hp 327 flowed quite a bit less.

 

@Gman0046: Thanks. I see but I don't know how to identyfy the correct version.
@bowie : That's right as far as I've researched. But I need help to identify the carb when I search one on ebay.
@Fordors : Thanks. Do you know for example from wich year to wich year the 1850-3 was build? Holley gave every update a new number: 1850-1, 1850-2 .... But I found no information in wich time frame these versions were produced.
@markyac : So if the tag is gone, it's not possible to identify the build year?

 

Thanks a lot for all the answers.
My problem is: if I start searching a 1850 or a 4GC how can I identify that it's a pre 65 carb?

 

Lyn, the 66 327/275 Holley was a 540 cfm model. It came with rear metering plates instead of jets.
All Q-jets were 750 or 800..1.09 primary, and 1.21.

 

Sorry, I have no information on the timeframe for the various 1850's. An 1850-3 that I have new in the box was bought from a neighbor 20 years ago and has the plastic items I mentioned, and in looking for new ones sold currently I see a new List number, it is 1850C. It has a completely new look, new logos cast on the main body and float bowls and they have removed the externally adjustable needle and seat ***emblies.
If you did locate a nice -3 and it had the plastic pieces you could change to the die cast manual or automatic choke and also the vacuum secondary cover to make it look more correct. I think the appearance of the Chevrolet throttle arm would not necessarily be a deal breaker.

 

Was there any love for the quadra jets?
As I remember them they were not bad carbs. Small primary for good mpg and when you kicked in the secondary's there was this very distinctive sound.
Those secondary's were as big as coke bottles.
I just know a few that loved the old quadra jets, but have not seen any love for them on the H.A.M.B. maybe they were just to modern.

 

Steffen - what year are you trying to match?

The early 327's used Carter WCFB's and Rochester 4GC's on the lower HP engines (250 HP or so). They used Carter AFB's on the higher HP engines in 1962, 63, and 64. Also in 1965, but the highest HP engines in 1965 and 1966 used Holleys.

In 1966, the 275 HP 327 used a Carter AVS.

Approximate CFM:

Carter WCFB's (used on the 327) 500
Carter AFB (used on 327) 575
Carter AVS (used in 1966) 630
Rochester 4GC (used on 327) 550

Not a Holley expert, don't know, will leave to others

The Rochester Q-Jet was first used on the 327 in 1966. And while the later (1968 and newer) Q-Jets are absolutely excellent carburetors, the 1965~1967 are best left to those doing numbers-matching showcars. The Q-Jets were available in 3 sizes: 750, 800, and 850. The 850's are rarely seen, and are quite expensive.

As to identification:

WCFB - tag only
AFB (Chevrolet) stamped on edge of mounting flange between left-most idle mixture screw and choke housing
AVS - same as AFB
4GC - tag, but some are stamped, see link: http://www.thecarburetorshop.com/Carburetor_ID_Rochester_4G.htm

As to which numbers for which to look, see link: http://www.thecarburetorshop.com/Kchevrolet2.htm

EDIT: One interesting thing about the 4GC is they also came in a 700 CFM, and if the tag is missing, not one enthusiast in a 1000 will know the difference when mounted on an engine. GREAT street sleeper!

Jon.

 

The 66 327/275 came with three different carbs. The manifold was cast with the name of the appropriate carb.
750 (1.09) Q-Jet,
540 Holley,
AVS Carter
The 340 horse 409 had the bigger 4 GC..Good luck finding that one
I'll look for the 4GC info.

 

I've actually found the big 4GC's on chevy/GMC dump trucks with 348 or 409s in them. The ones I found were not governed carbs

 

Steffen, The 1960 carb had a 1.00 venturi on the primary side .(not the throttle plate)
The 64-66 PP 283 and the 327 /250 had a 1.125 .
Otherwise, they look the same.
I wouldn't put the 60 carb on a 327..Minimum, a 1.125 carb. (500 and change CFM)
1960 348 / 250 had the 1.125 venturi also.

 

I think my first question would be...what intake do you have? If you have a square bore intake, you wouldn't want use a Q-jet and if you have a Q-jet intake you wouldn't really want to buy a Holley.. Unless you didn't care about using an adapter. When you do get ready to buy something. Check out Able Automotive on line. They send stuff out of country on a regulator basics. Gene.

 

Ok. I will build a periodic correct engine - not stock factory, but everything not younger than 1965.
So it's not interesting for me what was on wich engine 1966.
It's a small block with a square bore intake.

Good advice. I found some with the plastik pieces and also thought about a change.

I love them, but they came out '66 and as far as I see the are all big cfm like @carbking said.

A periodic correct engine - not stock factory, but everything not younger than 1965.
A 327 mild small block with a square bore intake.

They are to young and I think too much cfm.

Interessting! I will check this.

I love such ideas! In my case I think I will not need too much cfm.

 

What is a "governed carb"?

 

A square bore.
Do you have a link? There are thousands Able Automotive on line.

 

That's the intake:

 

I stand corrected! You are correct. I was thinking of my 30 Roadster that I had back in the 60's. It had a crate 327 fuellie motor but with two WCFB's instead. They were off of a 283 if I remember right.

 

Well I was close and did prime the pump.

thanks for the correction.