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Old 03-20-2011, 07:38 PM
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1956 Thunderbird carburetor

I have a 1956 Thunderbird with a 312 cu. in. engine. I replaced the Holley 4 Barrel carburetor with a brand new Edlebrock 4 barrel carburetor. I eliminated the slight hesitation at takeoff and increased the horsepower. However, at idle I have a slight engine vibration, the idle is not even. The tachometer read is normal, but I know the engine is not idling correctly. We have tried adjusting the jets but this only helps slightly. I was told that if I went to a complete electronic distributor, I would eliminate the problem. But I am not sure. Any suggestions?

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Old 03-20-2011, 07:45 PM
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Did you adjust the idle mixture screws in front?
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Old 03-20-2011, 10:39 PM
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This is where an engine scope is great. I often wish I still had my old Sun 1080. The first thing to do with any drivabilty issue is to make sure all the ignition is up to snuff before you attack the fuel system. If you could get it to a good mechanic with an old scope, who knew how to use it, he could tell you in 15 minutes. Check all the firing lines, do a cylinder balance, then put it on the 4 gas to adjust the carb. Perfection that few, if any, tuners can match doing the "by ear" and guessing method.
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Old 03-21-2011, 02:34 PM
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Quote:
Originally Posted by bigdog7373
Did you adjust the idle mixture screws in front?
Yes, or as we called them years ago, "The Jets." When I had the old Holley on, I had no problem, now the slight vibration of the engine is hard to tackle and without a scope. Nobody seems to have one. Is the all electronic distributor a cure? Or is this a hopeful wish? Thanks
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Old 03-21-2011, 05:24 PM
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vacuum to dist.

the distributors changed for 56 to 57. The edelbrock would probably work better with a 57 or later distributor. Different vacuum porting is required when you hook up the dist hose
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