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The Cars => 1966 Shelby GT350/GT350H => Topic started by: tbone1209 on June 17, 2020, 08:55:19 PM

Title: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 17, 2020, 08:55:19 PM
Hi- new poster. I have an old timer hot rodder buddy that has what a[ppears to be an original Shelby quad Weber manifold that he purchased about 20+ years ago when he had his GT350. It's been sitting in his warehouse and he now is thinking about selling the set but doesnt really have any idea what it's worth. I've attached some pics I snapped of it and some old pics of his 350 with it on.

Could someone give me an idea of what its worth, assuming it's not a copy?

Thanks!
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 17, 2020, 08:57:50 PM
more pics
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: SFM5S000 on June 17, 2020, 10:13:53 PM
Hello tbone1209,

The manifold is a later "Shelby" catalog item. Depending on the series of the Weber's, there are stamped numbers on the flanges of the base on each carburetor. Can you post a pic or list the two sets of numbers of each carb. That would help tremendously on determining their value.
There are a few Weber guys here on the forum, myself included.

Cheers,
~Earl J

ps, one of the velocity stacks seems to have been modified (shortened) It looks odd. I have a few spares. Shoot me a PM I'll send you one free/no charge but you pay the postage. $7.00 I think.
~E
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: JD on June 17, 2020, 10:55:31 PM
Here is a photo summary of some of the Weber variation that was posted on the forum before (may have been Dan Case?) 

It may help with identifying the version of carbs your buddy has...

(seems to be the 4th version 1970 or later, others will know better)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: JD on June 17, 2020, 11:04:46 PM
images rotated... hope that's OK, can delete if you want

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 18, 2020, 07:26:44 AM
The carbs without the cast in mounting side tabs (JD calls bosses) are more desirable to the Cobra and GT40 guys. The lack of tabs dates them generally to the mid 60's or so.

Other then the tabs, they are functionally the same providing that the casting says made in Italy and not made in Spain. Spain castings are a recent phenomenon and not from the '60s or even the '70s. Sometime in the '90s I think?


The SHELBY manifold is desirable to the "Shelby guys" but so is the COBRA casting.
One thing is that you can't say that the manifold is a "reproduction". No one to my knowledge is recasting the SHELBY lettered version.


If you can see the COBRA lettering on the water neck when installed then it is correct for a "Mustang" application but as far as I know, never offered originally by Shelby and something that Inglese worked on around 1980 at getting made BUT is very desirable for a Mustang installation.

Initially the Shelby(Mustang) installation was using the COBRA water neck and just turned upside down so you couldn't see the COBRA logo.


Most Weber setups that I have seen selling are going to trade in the $3000 to $3200 vicinity and that would be a fair price.

The GT40 manifold is a different story. It has no performance advantage but is a unique casting and engineering number.


Small parts like rod ends in the linkage are not significant price wise if they need to be replaced. Even velocity stacks are nickle and dime items.

The main thing is that all of the castings are undamaged.


The early carb castings, which these are not, are worth more but it's difficult to put a number on them? Maybe $500 more for the set? Opinions will vary on that one. Many won't care about that detail.

SOME very early '60s carbs are serial numbered. There is a small but exclusive market for those. You could probably name your own price for those carbs since they would probably be going on factory race cars?

They will be stamped on the mounting flanges IDA, IDA-1, IDA-4. The IDA-1 will be the GT40 "original application" carbs, but the carbs in the pictures have tabs so they are not those carbs. Most likely stamped IDA-4.


If any of the carbs need servicing, then that's on you. It generally doesn't affect the value significantly. Most parts are available and the IDA's are not like the Holleys in drying up the bowl gaskets because there are no bowl gaskets.

The largest, most common problem that used carbs have are twisted throttle shafts. They are made out of soft brass and twist easy with too much throttle return spring pressure. You can get replacement shafts for them now but they aren't cheap.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 19, 2020, 03:22:09 PM
Thanks for all the info and offer for the velocity stack! I think think the owner has a few extra.

Snapped some more pics of the manifold and Carbs yesterday. I don't see any casting identification aside from the Shelby logo. Where would the "made in ****" info be located? He said he's had the setup for well over 35-40 years.

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 19, 2020, 03:28:32 PM
More pics 👍

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 19, 2020, 04:02:42 PM
The carbs are IDA-4's. Bologna, Italy.

The manifold is a Buddy Barr and they are usually marked that underneath on the bottom of the manifold.

I'm not that familiar with the Shelby logo version. I never had one in my hands.

SOME Buddy Barr castings have no id's on them. MOST do.


He has the COBRA logo waterneck which was made for the 289 Cobras and to use it on a Shelby/Mustang, you need to turn it upside down with the COBRA logo pointed down so you don't see it. It would appear from your photos that is exactly what is there.

I'd speculate that the COBRA logo was just machined off but maybe it was made that way, who knows for sure unless they were there at the time? The important thing is that it works. There are current reproduction waternecks readily available
if necessary. That is no kind of issue.

That makes sense since I don't think the Mustang versions were made until about 1980?



Look down the throats of the carbs. See if you see a number like 37 or 42. Stock that carb came with 37mm "chokes" or what Weber calls, "auxiliary venturi". Originals are cast and have size identification you can see from the top.

The GT40 version, the IDA-1 came stock with 42's.

Either one is fine but you may decide that for a 5.0L, you are happier with the 37's.
42's take a little torque out of the engine but give you noticeably more top end.



The date code is E6. You need to ask Dan Case what he thinks that is for.

The carbs have the tabs so I don't think they are from '66, probably May of'76? That would fit into the time frame that you suggested.



I don't see the linkage so I can't comment on that but the 289 Cobras used a center shaft with clamp on throttle arms for the carbs. That's what the two threaded bungs are for on center of the manifold.

A Shelby would use a side mount bracket bolted two the studs between the left side carbs.


It's a nice set up and should clean up well and easily.

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 19, 2020, 04:16:35 PM
Thanks for the info Doug. The water neck has the cast platform which would normally have the "Cobra" cast in but the platform on this neck is completely blank. I've attached a couple pics down the throats and the linkage.

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 19, 2020, 04:50:40 PM
The linkage is a little "unique". I haven't seen that type of bellcrank and NEVER saw a throttle rod bent like that from bank to bank.
That really kills the ability to fine adjust left to right and sync them correctly.

I think with this set up, 1) the entire assembly needs to be vapor blasted 2) carbs gone through 3) linkage replaced entirely and 86 the fuel line set up.

So if you send it to Inglese about a thousand bucks for that? If carbs need throttle shafts, bearings, or a couple of brass floats more.

You're missing a couple of heat insulator gaskets but at least who built it knew the need? That probably means they have Gene Berg glass ball inlet valves too? They found out about fuel boiling and causing big time flooding.


Those are the K&N air filters. The thing is that you can't use air filters with individual runner manifolds. The overlap of the camshaft pushes fuel back out of the carbs. The filters will get saturated with atomized fuel and when you go to restart a hot engine, there is flame travel (not backfire) through the intake manifold and it will ignite the filters.

Sell 'em to the VW guys. They love'em on their dune buggies.


Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 20, 2020, 12:21:15 PM
Quote from: shelbydoug on June 19, 2020, 04:02:42 PM
The carbs are IDA-4's. Bologna, Italy.

The date code is E6. You need to ask Dan Case what he thinks that is for.

The carbs have the tabs so I don't think they are from '66, probably May of'76? That would fit into the time frame that you suggested.


To me E = May and 6 plus the die cast zinc accelerator pump jet assemblies are most likely means 1976. In my notes zinc assemblies show up the first time in April 1971.

The original E. Weber manufacturing company dropped serial numbers by September 1970 and continued with date codes from them on. 

The "SHELBY" lettered intakes, carburetors, or complete induction systems were sold by parts businesses Mr. Shelby owned or partnered with (Autosports® comes to mind) and all the major mail order catalog 'speed' businesses and places like Sears, Roebuck, & Company® and Montgomery Ward® between mid 1968 until about early in 1972. The hitch, "Shelby" sold 48 IDA1 models for Ford V8s. In the 1966 catalog Shelby American claimed they were the sole importer of 48 IDA1 models.  Shelby American and Ford Advanced Vehicles used and sold IDA and IDA1 models in any mixture over their entire period of using new ones. (48 IDA and 48IDA1 models are exactly the same part for part except for which throttle lever E. Weber installed.  The levers E. Weber installed did not matter as Shelby's works and FAV replaced them with new levers of their own designs anyway.)



A vague reference in material published by  E. Weber in Italy (in Italian) indicate that the IDA 2C (two choke) models were created for GT40s.  I was hearing in the mid 1960s that Ford money paid for the tooling and came with the plan to buy one thousand carburetors over the life of the program. 48 IDA / 48 IDA1 models both used 42 mm chokes. (If you use the E. Weber system design guide formulas the maximum size choke a 289 Ford would require even at high volumetric efficiency is 41 mm.) The ready for manufacture drawings for the 48 IDA were signed off late in 1963. The first carburetors didn't get to Shelby until about late March or early April 1964.  The first version of factory over haul kit listed the application as "Type 48 IDA-IDA 1 FORD Cobra Lotus".  My translation right or wrong is GT40, Cobra race cars, and Lotus 30 (all powered by 289 c.i.d. 8V engines at the time).


Dean Moon's businesses (multiple) made 48 IDA 1 models available by 1965 and well as intakes for all kinds of applications. Moon also sold "Cobra" 289 Ford induction systems. Circa early 1966 Dean Moon released 48 IDA4 models. I have some handwritten letters between Moon and a potential customer. Along with the letters was the offering of 48 IDA4 models for engines of too small displacement to use 48 IDA1s. 48 IDA4 models left Italy with 37 mm chokes. (There were also 46 IDA2 and 46 IDA3 models for even smaller engines.) By 1967 Geon® started offering 48 IDA4 models as service replacements.


For the Boss 302 engine fans there was a "CS SHELBY' lettered intake after Boss 302 Mustangs came out.

Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 21, 2020, 09:50:13 PM
Thanks Dan. Appreciate the info. Here are a couple picks I took today of the underside of the manifold. There didn't appear to be any information on the bottom.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 22, 2020, 07:13:46 AM
When anyone is discussing the size of the chokes, they are talking about "tuning".

I like 40's but 42's on my Cleveland are ok also. It depends on your likes and the engine displacement.

I can't see the numbers in your pictures because of lighting but I think those are 37's? Those are fine.


I remember when Gary Hall was selling complete bolt on systems for Panteras, he was supplying them with 32's. I don't know anyone with that setup so I don't know how those run but I would speculate that the engine runs out of rpm around 5500 to 6000.

I remember taking a demonstration ride in Andy Carr's Pantera around 1982 when Jim Inglese had it in "the shop" setting the Webers up in the car. I was never told what chokes were in it. It was very torkie. Probably 37's.

I haven't heard of Andy since?
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 22, 2020, 12:13:05 PM
Quote from: tbone1209 on June 21, 2020, 09:50:13 PM
Thanks Dan. Appreciate the info. Here are a couple picks I took today of the underside of the manifold. There didn't appear to be any information on the bottom.

You are welcome.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: 6s2055 on June 22, 2020, 03:38:27 PM
When I bought CSX2192 in 1967 the Webers had a fuel log in front and each fuel line was black rubber.....gas line. No steel lines back then.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 22, 2020, 04:00:09 PM
Quote from: 6s2055 on June 22, 2020, 03:38:27 PM
When I bought CSX2192 in 1967 the Webers had a fuel log in front and each fuel line was black rubber.....gas line. No steel lines back then.

Yup. Everyone calls that the FIA fuel log now.

What's interesting with the factory Weber set up is that there was no fuel pressure regulator at all.

Whatever the fuel pump was kicking out is what the carbs got.

I would be interested to see how they dealt with isolating the carbs from engine heat.

It was similar to this one but just normal period fuel line connections to use with hose clamps. This one is Cobra Automotives to use with -6 AN fittings and hose.

The same basic concept though.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 22, 2020, 04:32:46 PM
Quote from: shelbydoug on June 22, 2020, 03:53:14 PM

What's interesting with the factory Weber set up is that there was no fuel pressure regulator at all.

Whatever the fuel pump was kicking out is what the carbs got.

I would be interested to see how they dealt with isolating the carbs from engine heat.

It was similar to this one but just normal period fuel line connections to use with hose clamps. This one is Cobra Automotives to use with -6 AN fittings and hose.

The same basic concept though.

Most of the time SA just used and sold the thin off white celluloid paper gaskets made locally to SA by Miller Manufacturing. To me they were totally wrong gaskets as they were very weak. Strong suction pluses would literally pull the gaskets into the bores if the mounting nuts were not sufficiently tight. I have pictures I took of a system Bob Johnson used that sucked in two gaskets to create severe vacuum leaks. I have purchased two unrestored intact COBRA systems with early carburetors and Shelby race shop hardware. Both of them had at least one original Miller gasket sucked in. Look close, you can read Miller on the gasket. I contacted them years ago but they didn't have records going back into the 1960s.

(http://www.saacforum.com/gallery/274-220620201752.jpeg)

SA and SA supported Cobra racers sometimes, but not always, used thick asbestos gaskets. I have one used original set and one new old stock factory set in my samples collection. Occasionally, SA used thick GT40 engineered material spacers and two thin gaskets on at least one team car.  (I have never had one in my hands but I am guessing a phenolic compound of some type.)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 07:06:57 AM
One of the early stops alone the learning curve with Webers that I had was that the carbs had to have heat isolation or they would flood.

I don't even know how Bob Johnson could run the setup with those gaskets?

In fact in addition to the thick asbestos gaskets, the glass ball inlet valves were needed.

Johnson's set up is a contradiction of my known facts. That's a stunning revelation but actually disturbing to me. I'm afraid to start the car now?  :o

Thanks for posting the picture.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 23, 2020, 08:32:44 AM
I would have to dig out the data but cylinders with sucked in gaskets on two works systems I took apart had very different jetting than the others so somebody knew something was wrong.
   

I had base gaskets made (water jet cut) by a local gasket, hose, and seal company that served many of the manufacturing plants in North Alabama. I chose an industrial gasket stock I used for decades in high pressure chemical processing. It worked for all kinds of harsh chemicals and could withstand 3,000 psig  or millions of cycles between 200 and 1,100 psig between bolted flanges as ring gaskets. It could also withstand vacuum.  Plus it is reusable as long as it was not cut or physically damaged. Since then I have seen others use the material in other rare systems like box ram intakes and gasket sets for AUTOLITE® in-line 4Vs.


Thermoseal® KLINGERSIL® C-4401
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 10:03:47 AM
Quote from: Dan Case on June 23, 2020, 08:32:44 AM
I would have to dig out the data but cylinders with sucked in gaskets on two works systems I took apart had very different jetting than the others so somebody knew something was wrong.
   

I had base gaskets made (water jet cut) by a local gasket, hose, and seal company that served many of the manufacturing plants in North Alabama. I chose an industrial gasket stock I used for decades in high pressure chemical processing. It worked for all kinds of harsh chemicals and could withstand 3,000 psig  or millions of cycles between 200 and 1,100 psig between bolted flanges as ring gaskets. It could also withstand vacuum.  Plus it is reusable as long as it was not cut or physically  damaged. Since then I have seen others use the material in other rare systems like box ram intakes and gasket sets for Autolite in line 4Vs.

Does that material have heat isolating/transfer limiting properties?

I've only seen asbestos gaskets about 1/8" thick for IDA's.

Holleys are different. They are using some type of a compressed paper material with some type of a rubber/plastic compound" o-ring around the carb mounting studs.

They are not as good as the "Weber" materials and as I write this, are still causing heat riser/transfer issues.


Not to pick on even factory teams of the era, but there was a steep learning curve with likely very little development time available?

What you showed me from Bob Johnson's car just looks like a DNF across the board to me?


I was shown that car specifically when Ken Eber had it in his garage in Chappaqua. It had the early sand cast versions of the pre-IDA's on it. ;)

CSX21?? something..."first Cobra to win a race!" etc, etc, etc. I know the number, just don't recall it at this moment?

I never heard it run.

Although I was allowed to look, there was real danger of having a stun gun used on me if I was deemed too close.  ::)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 23, 2020, 10:42:47 AM
I don't recall heat transfer data. I use to know during my former industrial work life.

If we go out for an hour or so, pull the top of the carburetor right next to the coolant expansion tank (the carburetor that gets the warmest), we find carburetor bodies relatively cool to the touch and fuel in the bowl around 85°F. It takes several minutes after shut down to reach boiling temperature, which at 5,400 feet is right around 115°F to 124° depending on brand and grade of fuel. For test session purposes, we use external gauges to watch fuel level before start cold, during start up, engine running, and what happens during heat soak after shut down. We worked the fuel level down until boiling at the worst period of heat soak wouldn't over run fuel out auxillary venturi passages and down the into the engine.  (The same post shut down fuel boiling was a problem in our car with a 4V and the solution was to lower running fuel levels just enough. Some of the folks around here with got fast cars only use electric pumps which they can shut off and run fuel out of their carburetors before shut down. Some others just converted to closed systems  fuel injection.)

I was concerned that main system start would be delayed too much but it was fine. Our mains are working by 30 mph in fourth as evidenced by changes in main fuel jet sizes result in the predicted changes in air fuel ratio (we have sensors in each header collector).
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 10:59:13 AM
You are trying to make my head explode aren't you?
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 02:57:38 PM
Weber insulating gasket. Looks mostly like an asbestos alloy. No way it can get sucked in. It's rigid material.

Now I need to put this back on my car.  ;)


In my experience, you want to keep the fuel levels high, not low. IF you should have the misfortune of running the bowl dry under WOT, you will "backfire" through the exhaust.

IF you are LUCKY, you will just blow the muffler up, literally. IF NOT, you will punch a hole through the piston.


As was pointed out by Drew in regards to the Holleys, the float needs to drop a certain amount to open the valve completely. The only way you can do that is to keep the fuel level high enough to provide adequate float drop and consequently full valve opening.

So he is saying it "different but the same" (thanks for that phrase Bob) then me.


He also said something about so many Holleys having TOO MUCH fuel pressure, They only need 5 psi. The same is true of the Webers.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: 98SVT - was 06GT on June 23, 2020, 03:37:30 PM
Does he still have the Mini Lite wheels? I'd like another set of those. I let mine get away years ago.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: SFM5S000 on June 23, 2020, 05:22:16 PM
Quote from: shelbydoug on June 23, 2020, 07:06:57 AM
One of the early stops alone the learning curve with Webers that I had was that the carbs had to have heat isolation or they would flood.

I don't even know how Bob Johnson could run the setup with those gaskets?

In fact in addition to the thick asbestos gaskets, the glass ball inlet valves were needed.

Johnson's set up is a contradiction of my known facts. That's a stunning revelation but actually disturbing to me. I'm afraid to start the car now?  :o

Thanks for posting the picture.

Doug,

For a street driven car your comment regarding the necessity of a heat isolating gaskets definitely applies, but for a pure race car such as Bob Johnson's Cobra I can understand the paper thin gasket such as the photo Dan Case posted. The race car would be running flat out for 1 1/2-2 1/2 hours or however long the event would be. The car wouldn't sit long enough typically (except for an unusually long pit stop for some reason) ambient temperature fuel would be constantly running through the carburetors. That would be my explanation for the thin gaskets.

Cheers,
~Earl J
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Dan Case on June 23, 2020, 06:01:48 PM
To the original poster. I apologize for hijacking your thread. You have a neat period accessory. I'll stop with this reply.
Dan

Quote from: shelbydoug on June 23, 2020, 02:57:38 PM

In my experience, you want to keep the fuel levels high, not low. IF you should have the misfortune of running the bowl dry under WOT, you will "backfire" through the exhaust.

Stock bore, ex-Le Mans Shelby team GT40 heads, Le Mans cam, headers, and 11.6:1 SCR.

12.7 - 13.1 AFR during a long WOT run and the fuel pressure only drops about the width of the pressure gauge needle so the stock pump keeps up just fine on a hot summer day.  Filling the bowls after an over night or longer dwell restart takes some seconds where there is only about 1 to 2  psig of fuel pressure at the fuel log indicated until the bowls fill so there is plenty of float drop. I am using 2.50 valves out of a SA customer's 1965 race engine.

Multiple issues can lead to high rpm WOT lean conditions, live running fuel level is just one. As long as the main starts as soon as you pass the last transition port and doesn't stop until throttles are closed again, that is all that is required and that is easy to check (oxygen sensors systems are real handy). 

I assisted two Cobra owners that were running out of fuel to the point of engines died over about 4,000 rpm and in both those cases they had kinks in the fuel line between the pump and engine and didn't know it.  Reworking the lines into long curves did the trick. When we bought out red car it would run out of fuel with a small 4V the first two drives around the neighborhood. You may have guessed, but a hose between the pressure regulator the former owner used and the carburetor was way too long and doubled into a kink against the left side inner panel.  Shortening that hose solve that one.


One of the most troublesome details about these carburetors is doing the bench needle valve and float settings E. Weber outlined only gets you running. The factory literature indicates that you were suppose to check the actual liquid level and adjust as required. Every 0.001 inch change in needle valve setting, gasket thickness, or float tang setting means a 0.005 inch change (in significant figures) in wet fuel level. I laid everything out in CAD to test the math and then we did of experiments with a carburetor in our car. It worked perfectly and made changing levels a math equation and a few minutes to make the changes and verify the results.

One day I weighed and measured  all the floats for three sets of carburetors. I tried to check the angles of brackets to floats the best I could. I picked the six closest to each other in every way and sequentially installed them into a single carburetor. The body had an external sight gauge installed. Surprise. The live fuel level with three floats was within experimental error the same. One float produced barley higher liquid level. One float provided slightly lower fuel level; I would not have tried to change it. One float allowed so much fuel in the sight gauge overflowed.  We made several repeats and even tried that wild float in the car. The wet fuel level range I could measure was 0.4 inch lowest to highest with six floats I tried to match by physical measurements.  One carburetor six floats and different results.  I suspect that is why the  E. Weber company recommended check actual fuel levels in the car.

I experimented with that wild float several hours one day. My conclusion was that the bracket attached to the float was bent a few arc seconds from where the other five were. I tried changing that angle a tiny amount but always over shot; one bend would make fuel level super low and the next might have fuel over flowing.  The only solution I could think of was design and build a fixture with jack screws to slowly adjust the angle until live fuel level matched the others.  Interesting idea but not a priority  to spend more time on as floats are cheap relatively speaking.

(http://www.saacforum.com/gallery/274-230620190827.jpeg)

Bystanders around when we start the car are typically disappointed that the engine is easier to start cold or hot than most stock 289 powered cars of any kind, cold or hot the engine settles into a smooth idle quickly (no jabbing of the throttle or extra rpm required), and running at idle it is not as loud as most of the 1960s hot rodded cars they might know. The mechanical valve lifter and rocker arm sounds are the only clue the engine is not a demure stock 289 2V Fairlane engine. Some seem to be disappointed that leaving a parking place takes no more effort or created no more drama than leaving a parking spot in our 2015 Ford F150 pickup truck.  In all respects except fuel mileage the red car with 4-2V is much easier to use than the black car with 4V. I used to think the black car was quick. It would out run anything small block with fenders at Hallet except GT40s and a Genie sports racer somebody use to bring. The Pantera with Webers that showed up one year sounded good but it was not tuned well and I passed it. The red car with 4-2V makes the black car seem like a really old antique with a four cylinder engine. The red car is fun but took a lot of development and learning to get there for all around ease, great manners, and exciting acceleration. It was fun to experiment, develop, and learn. I don't know that I would do another engine though.  The plug and play fuel injection systems make life so much easier especially if you drive been near sea level and the top of the Rocky Mountains and use whatever fuel you can find on the road.


I tried using 4-2V just as SA put the systems in use. The engine was a fine on off switch but road manners were horrible. Right out of the box as new WOT was fine, every other situation left something to be desired. These systems won't be worth the effort to many people and they won't like the nasty manners they had as SA used them.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 07:36:32 PM
I've never run these carbs under race type conditions so I'm not aware of the significance of this "issue".

I am constantly glared at by my 32 year old son who constantly tells me that carbs are BS and a total waste of time on this type of detail.

I do readily admit that I spend entirely too much time on trying to get float levels just right. Holleys are just the worst there is. You get them right, then the car sits a week and then the inlet valves stick...yet again. :(

That just doesn't happen with glass ball valves.


Earl, at some point the engine needs to be shut off and I would lay heavy money on these carbs as set up by the factory as erupting like Mt.Vesuvius but with gasoline.

Personally, my approach was always to make them safe to use in a street car and getting race performance out of them. That's just me.


At this point, exactly what the factory did to race them is purely accademic ALTHOUGH, yes Dan, I did write that I'd like to see the factory set up but frankly, "I wouldn't send a kid up in a crate like that". ;D

With that remark, someone might say "you don't know anything". Fair enough but maybe the answer is I know too much? ;)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: pbf777 on June 23, 2020, 08:29:58 PM
Quote from: SFM5S000 on June 23, 2020, 05:22:16 PM

,,,,,,,,,, but for a pure race car such as Bob Johnson's Cobra I can understand the paper thin gasket such as the photo Dan Case posted. The race car would be running flat out for 1 1/2-2 1/2 hours or however long the event would be. The car wouldn't sit long enough typically (except for an unusually long pit stop for some reason) ambient temperature fuel would be constantly running through the carburetors.

Cheers,
~Earl J



      Actually, under any reasonable load to W.O.T. one would find that the carburetor(s) and intake manifold port runner castings will be found to be significantly cooler than the surrounding ambient air temperature as the combination of throttling, this creating the effect of expansion and reduction of density of the incoming atmosphere, and, this coupled to the vaporization process involved of the atomized fuel particles/droplets emanating from the carburetor(s) within this air stream these both creating a significant cooling effect.             ;)

      Where's that airplane engine guy, John, he for sure understands about carburetor freezing/icing !         8)

      And with the above understood, and one look at the not so substantial  pair of ears of the intake to support the Weber's, then one is led to believe the original intention was to have a thin sealing gasket, not to permit the use of a thick pliable filler here, which even with instruction would inevitably be over torqued causing distortion to the ears, and failures in sealing or even casting breaks.  That is if one is going to attribute any foresight capacity to the designers anyway?           :-\

      Scott. 
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 23, 2020, 09:21:18 PM
The cooling effect is so good, that the carbs will ice up anytime under about 40 degrees.

Different considerations for street or race. "Necessity is the mother of invention". Street use requires "improved" engineering.  ;)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: SFM5S000 on June 23, 2020, 10:25:44 PM
Okay fellas,

We've highjacked the heck out of the original poster's post. Enough already, myself included.

Okay a set of four mid-ish 1970's IDA-4's with date codes and a "Shelby" cast logo manifold (not my choice in linkage (scary), my opinion only, but fixable). I'd say the value would be in the $3800-$4500 if everything was cleaned up. At the end of the day it boils down to what anyone is willing to pay and how far down the seller will go.

Cheers
~Earl J
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 24, 2020, 09:16:12 AM
Thanks! That's what I was looking for. Great discussion though!

Parts are now in Classified section at 4k OBO.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: shelbydoug on June 24, 2020, 09:38:55 AM
Good luck with your sale.  :)

My suggestion is that you lock the for sale ad. You don't need people commenting on it. They can pm you with offers or questions.
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 24, 2020, 09:48:46 AM
Thanks for the tip. I've locked the topic
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: Chris Thauberger on June 24, 2020, 10:57:01 AM
Nope, you locked the classified ad thread.  ;)
Title: Re: Vintage GT350 Weber manifold with Webers
Post by: tbone1209 on June 24, 2020, 11:38:48 AM
Ahh... Yea, got it