One last thing. Today I noticed that under my carburator there is some kind of spacer. The spacer seems to fall apart and one corner of the carb is unerlayed with couple of washers (???). Do I need any of that with the new Edelbrock carb (I guess not) ?
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You will need the spacer plate with your new carburetor. The reason for the tapered spacer is that the motor is at an angle and the spacer allows the carburetor to be level. New spacers are available if yours is too far gone.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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Yes, you will need a gasket above and below the spacer.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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Measure your studs. Are they long enough to support a tapered spacer? You are ordering a TAPERED spacer, right?Member, Sons of the American Revolution
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From: Royal Oak, MichiganComment
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The following Monday I called Holley, gave them the casting number, and they knew exactly what happened. They informed me that "a batch" of carburetors were cast using too much lead. They instructed me to send it back and they would send me a new one.
They did send it as promised and the new one is on the car. I am satisfied that they stood by their product, however, I can't help but think about how long this one is going to last.
Since this episode I've googled the topic, but it is only mentioned is few sites and from what I can tell Holley has not issued a recall. I want to let uses of this site be aware of the issue. The casting number on my defective carb began with 4777.Comment
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This is the one I ordered:
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I have had other cars with Holleys and any issues with them was 'operator error'😀A Thunderbirder from the Land of the Long White Cloud.Comment
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Thank you Nyles. I know that MAC's are usually more expensive than others so I checked only Pat Wilson's where they have it for $60. Ordered it already but it's good to know that one should check all possibilities in the future.Comment
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So, the new Edelbrock 1406 carburetor is installed and running. Unfortunately, it did not solve the missing problem. As I looked into the carb while holding the engine in higher rpm, it's obvious that the fuel pressure is not constant and is dropping for short periods causing the carb/engine to starve for fuel.
The good knews is that replacing the carb obviously solved a vacuum leak issue that was present which solved my problem with non functional brake booster and the brakes now behave like on a new car! Not speaking about better fuel economy and overal reliablity over the original carb I guess. So I'm happy, I made this exchange.
Now I need to solve the rest of the puzzle meaning replacing the fuel lines and fuel pump(s). And here is where I need your oppinion. Presently I have the original mechanic pump on the car backed up with an electric one. Not sure which one is failing but I guess with the price of those parts I'm not going to investigate and simply replace both of them. Just need to know what config should I go with that would guarantie me easy starts (even after longer periods), constant needed fuel pressure for my new carb and overall stabilty. Here are the configs that I could go with and would like to chose the best one for my needs:
a) mech. pump only
b) mech. pupm + el. pump
c) el. pump only
d) el. pump with + fuep pressure regulator
Thank you for your advice.Comment
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need to know what config should I go with that would guarantee me easy starts (even after longer periods), constant needed fuel pressure for my new carb and overall stability. Here are the configs that I could go with and would like to chose the best one for my needs:
After sitting for long periods the electric can fill the carb for easy starting. Turn it off and drive with the mechanical pump. I have this set up on my 57 for several years with no problems and easy starting.
Make sure you use an electric fuel pump for carbureted engines with a low pressure of about 5 pounds pressure or you will need a regulator to reduce the pressure to that range. They work best if placed near the tank because they push fuel better than pull.Comment
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B would be my choice.
After sitting for long periods the electric can fill the carb for easy starting. Turn it off and drive with the mechanical pump. I have this set up on my 57 for several years with no problems and easy starting.
Make sure you use an electric fuel pump for carbureted engines with a low pressure of about 5 pounds pressure or you will need a regulator to reduce the pressure to that range. They work best if placed near the tank because they push fuel better than pull.Comment
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Any reason turning the el. pump off after startup
2 - Should there ever be a rupture in the mechanical pump's diaphragm, you might pump less gas into the crankcase. (It can happen but the chances are very slim)
3 - A safety concern is that if you are involved in an accident and can not turn off the ignition, the pump will continue to run and pump gas which could ignite if the car was overturned. This can be eliminated by a "rollover switch" which new fuel injected cars use, or by wiring through relays and or oil pressure senders which would kill the pump when there was no oil pressure. I think someone here posted a wiring diagram that was probably the safest method to wire an electric pump. Hopefully the link will be posted for you.
My cars set weeks at a time and start quickly once the carbs are full of fuel. In my case the electric pump only eliminates the long cranking time, and remain off after the initial startup, it does not improve performance in any way.Comment
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Jiri,
I was not aware you had an electric fuel pump also. How do you have them connected. You need to keep the fuel pressure to 6 lbs or below. I would definitely install a pressure regulator as most electric pumps will go over that. I would also take Joe's advice and have it switched where you can turn it off. I can't remember the last time I had a mechanical pump fail so I would only use the electric pump in an emergency. I never had a problem with starting when I changed over to the Edelbrock carb.
JohnJohn Pizzi - Squarebirds Administrator
Thunderbird Registry #36223
jopizz@squarebirds.org 856-779-9695
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