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Old 04-01-2020, 01:34 PM   #1
Burt Lake Barn
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Default Holley 94 vacuum port plug

I am looking for a source for the vacuum port plug that fits the Holley 94 carb. It appears to be an odd size / thread type. Any one have any info that might help me locate them?
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Old 04-01-2020, 02:19 PM   #2
flatheadmurre
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Default Re: Holley 94 vacuum port plug

SAE 45degree flare plug fits there...Eaton has them or any major supplier of brass fittings.
Thread is UNF if i got it right so not exotic...
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Old 04-02-2020, 10:21 AM   #3
scicala
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Default Re: Holley 94 vacuum port plug

The threads are 3/8"-24.


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Old 04-02-2020, 12:09 PM   #4
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Default Re: Holley 94 vacuum port plug

Thanks for the info guys
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Old 04-02-2020, 12:20 PM   #5
tubman
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Default Re: Holley 94 vacuum port plug

When I had to plug them, I always used a "Ford Nut" soldered up. Are you telling me a 3/8-24 set screw would have saved those rare pieces?
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Old 04-02-2020, 07:58 PM   #6
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Default Re: Holley 94 vacuum port plug

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I've cut off the end of a 3/8"-24 bolt before and then cut a screw drive slot/filed it flat, instead of using a brass original soldered shut.


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Old 04-03-2020, 08:22 AM   #7
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Default Re: Holley 94 vacuum port plug

Sal, does it need to be a ferrule type thread?
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Old 04-05-2020, 10:31 AM   #8
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Default Re: Holley 94 vacuum port plug

Answer to my last question was no based on small amount of vacuum being plugged.
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