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Carburetor setup.
Posted by: Bobdudeman ()
Date: February 12, 2018 07:41AM

Here's my question. I have for freshly rebuilt carbs for a 66 140 Monza. Is 4 carbs better than the single carb option? I'm really debating on using the cool looking intake and the single larger carburetor versus these four.

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Re: Carburetor setup.
Posted by: davemotohead ()
Date: February 12, 2018 08:01AM

4 well built carbs work a lot better than the center mount set ups.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Carburetor setup.
Posted by: Phil Dally ()
Date: February 12, 2018 08:23AM

X2...Striper's motohead carbs!!!

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Re: Carburetor setup.
Posted by: Bobdudeman ()
Date: February 12, 2018 08:39AM

Ok, why is there a difference? I was thinking ease of use

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Re: Carburetor setup.
Posted by: red monza ()
Date: February 12, 2018 08:44AM

My 140/pg runs great and is very dependable.

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Re: Carburetor setup.
Posted by: 66vairman ()
Date: February 12, 2018 09:08AM

This subject has come up many times.

The single carb on long runners seems attractive because of it's simplicity, but in practical use throttle response at low RPM is not as good and in cold weather you get fuel drop out (vapor condenses) in the runners yielding poor low speed driveability. On a dune buggy in the hot desert going wide open the setup works fine.

The stock carburetors work well if not worn, clean, and adjusted properly, a challenge with the four carburetor 140HP engine, but doable.

It has been over five plus decades and throttle shafts are usually worn out.Worn throttle shafts can be replaced. If the base shaft holes are worn then it's find another base or install bushings. I'm finding more carburetors that also have corrosion problems. The 65 and earlier carbs are more tolerant of this problem, but the 66-69 are not.

The other issue is debris in old gas tanks. Those little metal filters in the carburetor input are not adequate if the gas tank is full of rust and other debris. A GOOD disposable inline fuel filter is needed.

A fellow in the local club had his carburetors rebuilt and shortly thereafter the car would not idle. Problem was crap in the gas tank. Another came to a meeting all upset about carburetors from a known rebuilder - after a few questions he admitted the carburetors worked fine, but he parked the car for a year then dumped in new gas without draining his tank and now the car won't run - hmmmmm wonder why!

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Re: Carburetor setup.
Posted by: Frank DuVal ()
Date: February 12, 2018 09:41AM

Ease of use, that's stock carburetors! No fiddling with changing linkage. No fiddling with making a choke work. No fiddling with size of jets on replacement carburetor.

Frank DuVal

Fredericksburg, VA

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Re: Carburetor setup.
Date: February 12, 2018 09:47AM

Remember, Chevrolet had plenty of knowledgeable engineers working on their development programs.
Some also were involved in development work for racers using Chevrolet engines!
Don Yenko had this advantage after he began his Stinger project.

These engineers had access to any induction system they could design, but it was found to be best to mount the carburetors right on the head for best throttle response and atomization of the fuel.

IECO came up with the 4 bbl. adapter so they had a product to sell. They claimed all sorts of benefits, but the question remains. Is it better, really? or Just different....


Dan Davis ~ Pierce County, WA ~ CORSA Western Director + Corvairs NW + North Cascades Corvairs + Corvanatics
1966 Corsa Turbo coupe ~ ~ 1966 140 Corsa ~ ~ 1965 Monza 140/4 'Vert Sierra Tan/Fawn ~ 1964 Monza 'Vert (SOLD) ~ 1960 Monza Ermine White/Red PG ++ ~ 1965 Monza 140/4 Evening Orchid w/ ivory/black interior ~ 1962 Monza Wagon 102/4 ~ 1963 Rampside/Scamper ~ 1963 Red/Greenbrier ~ 1969 Ultra Van #468

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Re: Carburetor setup.
Posted by: Bobdudeman ()
Date: February 12, 2018 10:13AM

That all makes sense. I'll stick with the four carb setup

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Re: Carburetor setup.
Posted by: American Mel ()
Date: February 12, 2018 09:45PM

For cool factor, they both win.

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Carburetor setup.
Posted by: 66vairman ()
Date: February 12, 2018 10:48PM

Many years ago I did an article for the local club newspaper about one of the club members. He was a great guy (sadly gone now).

I asked him what attracted him to an old Corvair. He said he had owned a brand new 65 Corsa convertible and really liked the car. So after he retired he found a good used one similar to his original car. I asked him why he sold his first Corvair and he said "My mechanic talked me into letting him remove the four carburetors and installing one four barrel. It was a big mistake, the car never ran right again and I got so disgusted with it I traded it in on another car."

That story and other comments convinced me to stay with the four carburetors. Roger Parents carburetor linkage is a nice upgrade. Looks good and is accurate.

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Re: Carburetor setup.
Posted by: rlp11 ()
Date: February 13, 2018 12:05AM

Six carbs work better than four. Picture taken the day before I got it running. Not all is hooked up yet. Bottom picture is after I got it running.

Roger Parent
El Cajon, CA
1964 Monza Driver
1964 Monza Project



Edited 2 time(s). Last edit at 02/13/2018 12:08AM by rlp11.

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Re: Carburetor setup.
Posted by: Spectre ()
Date: February 13, 2018 05:38AM

That 6 carb setup is nice!

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Oklahoma City, OK

Click for Oklahoma City, Oklahoma Forecast

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Re: Carburetor setup.
Posted by: red monza ()
Date: February 14, 2018 08:54AM

Rip....nice clean install....very impressive.

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Re: Carburetor setup.
Posted by: davemotohead ()
Date: February 14, 2018 09:41AM

Race carbs and heads.





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Carburetor setup.
Posted by: Bobdudeman ()
Date: February 16, 2018 04:40PM

Those are awesome

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Re: Carburetor setup.
Posted by: Wagon Master ()
Date: February 16, 2018 05:03PM

Interesting concept Dave.
Straighten out the flow into the manifold.
Get carbs. up off the hot head. Cool the intake charge.
Where have we seen this.......wait.
A center mount 4bbl!


'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

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Re: Carburetor setup.
Posted by: davemotohead ()
Date: February 16, 2018 05:07PM

Wagon Master Wrote:
-------------------------------------------------------
> Interesting concept Dave.
> Straighten out the flow into the manifold.
> Get carbs. up off the hot head. Cool the intake
> charge.
> Where have we seen this.......wait.
> A center mount 4bbl!
-------------------------------------------------------
Not even close!





Email me at: Dave Motohead

1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Carburetor setup.
Posted by: American Mel ()
Date: February 16, 2018 06:13PM

Dave, Is there a thread that has ore info on this set-up?
From what I see, not including your cool custom risers, the carbs are rotated, AND the plenum volume is almost doubled!
Please elaborate on this!!!

.
-----------------------------------------------
WA. state, 1 mile south of the Canadian border,
I am not at the end of the world, but you can see it from here.
'66 Monza Coupe - 4spd, 140 Daily driver beater
'67 Monza Vert. - PG, 140 Daily driver beater

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Re: Carburetor setup.
Posted by: yenkomark ()
Date: February 16, 2018 08:23PM

Bought a sand rail engine several months,ago with the 6 carb setup..lots of good parts..well built

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