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Old 07-19-2025, 09:50 PM   #1
Vanspeed
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Default Re: 49 8BA has no power

Yes the engine has the correct carb on it, the owner sent Charlie an earlier version as he was not aware that the 94 changed at all. I also suspect that the mechanical advance might be seized. I am checking that on Monday.
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Old 07-19-2025, 09:54 PM   #2
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Default Re: 49 8BA has no power

The stock 8BA distributor has no mech advance. Only vac, so if it's not working you have no advance.
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Old 07-20-2025, 03:56 AM   #3
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Default Re: 49 8BA has no power

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Originally Posted by cadillac512 View Post
The stock 8BA distributor has no mech advance. Only vac, so if it's not working you have no advance.
that's my understanding too.

..and Google's AI confirmed it if that's of any significance. here is how i phrased my question to Google AI: "did the original 1949 ford 8ba distributor have a mechanical advance"

here's the response: "No, the original 1949 Ford 8BA distributor did not have a mechanical advance. It was a Load-O-Matic distributor that relied solely on vacuum advance for ignition timing adjustments. This type of distributor was designed to work with the original carburetor and wouldn't perform optimally with aftermarket modifications like performance camshafts or multiple carburetors."

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Old 07-20-2025, 11:28 AM   #4
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Default Re: 49 8BA has no power

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The stock 8BA distributor has no mech advance. Only vac, so if it's not working you have no advance.
Interesting. I thought it had both. We’ll see tomorrow if the advance works when I throw my timing light on it.
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Old 07-21-2025, 11:58 AM   #5
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Default Re: 49 8BA has no power

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Yes the engine has the correct carb on it, the owner sent Charlie an earlier version as he was not aware that the 94 changed at all. I also suspect that the mechanical advance might be seized. I am checking that on Monday.
The Holley 94 carburetor is part of the load-a-matic advance system. There is no mechanical advance system (centrifugal advance); only a vacuum advance system in which engine vacuum is used to advance ignition timing. It is possible that the vacuum-controlled advance plate in the distributor is stuck, but you can easily check that. Another possibility is that the vacuum diaphragm on the distributor has failed. If you have an adjustable timing light, you might measure ignition timing at idle and with the engine at about 2000 RPM. With the load-a-matic system functioning properly, you should see the ignition timing advanced about 20 degrees at 2000 RPM. Good luck.
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Old 07-21-2025, 06:15 PM   #6
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Default Re: 49 8BA has no power

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Originally Posted by 51shoeboxer View Post
The Holley 94 carburetor is part of the load-a-matic advance system. There is no mechanical advance system (centrifugal advance); only a vacuum advance system in which engine vacuum is used to advance ignition timing. It is possible that the vacuum-controlled advance plate in the distributor is stuck, but you can easily check that. Another possibility is that the vacuum diaphragm on the distributor has failed. If you have an adjustable timing light, you might measure ignition timing at idle and with the engine at about 2000 RPM. With the load-a-matic system functioning properly, you should see the ignition timing advanced about 20 degrees at 2000 RPM. Good luck.
Everything is good. I tested the vacuum at the carb and at the distributor. It was just very badly out of timing. Owner picked it up and said he can go 60 mph now! lol.
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