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Old 04-13-2020, 06:07 PM   #1
Art Newland
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Default Holley 94 auestion

While trying to get two usable carburetors together, I ran across this one that has a different fuel line fitting. Is this something that came stock or maybe it was used to repair the fuel inlet threads?
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Old 04-13-2020, 06:28 PM   #2
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Default Re: Holley 94 auestion

another pic
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Old 04-13-2020, 10:18 PM   #3
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Default Re: Holley 94 auestion

Yes, that’s a repair. More than one way to skin a cat, repair fittings have been around since back in the day, yours looks to be a modern version.
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Old 04-13-2020, 10:27 PM   #4
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Default Re: Holley 94 auestion

Any idea where I could get another?
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Old 04-14-2020, 08:27 AM   #5
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Default Re: Holley 94 auestion

It's a heli coil repair thread size 7/8 x 20 TPI. Look it up on Google.
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Old 04-14-2020, 09:58 AM   #6
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Default Re: Holley 94 auestion

Quote:
Originally Posted by jimvette59 View Post
It's a heli coil repair thread size 7/8 x 20 TPI. Look it up on Google.
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Old 04-14-2020, 10:34 AM   #7
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Default Re: Holley 94 auestion

I thought helicoils were stainless. That looks to be a brass insert of some kind. Keensert?
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Old 04-14-2020, 10:46 AM   #8
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Default Re: Holley 94 auestion

The threads in a 94 bowl should be 1/2 x 20. That does look like a insert to me not a helicoil. I think either will work as long as its installed square, it has to seal with the gasket.
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Old 04-14-2020, 10:55 AM   #9
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Default Re: Holley 94 auestion

You'd probably be able to find an unmodified carb top easier, Art. Unless the repair is truly a commonly found and well known device.
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Old 04-14-2020, 11:02 AM   #10
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Default Re: Holley 94 auestion

I would think a common Helicoil would have a tendency to leak in that application. I would prefer to use some kind of insert.
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Old 04-14-2020, 11:28 AM   #11
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Default Re: Holley 94 auestion

Quote:
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You'd probably be able to find an unmodified carb top easier, Art. Unless the repair is truly a commonly found and well known device.
You're probably right Mart, my bench already looks like a Holley 94 graveyard. I do have another coming in the mail that looks to have good threads. This seems to be such a common problem you'd think someone would make a repair kit. I'm a repairman at heart, I want to fix it!
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Old 04-14-2020, 03:29 PM   #12
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Default Re: Holley 94 auestion

Quote:
Originally Posted by jimvette59 View Post
It's a heli coil repair thread size 7/8 x 20 TPI. Look it up on Google.


How could it possibly be a 7/8 x 20 thread ? The boss on the carb isn't even that big.


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Old 04-14-2020, 03:54 PM   #13
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Default Re: Holley 94 auestion

The brass part that is marked ".098" looks to me like the fuel inlet/seat of off a Stromberg 97? I don't think it's a 94 Holley part.
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Old 04-14-2020, 09:13 PM   #14
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Default Re: Holley 94 question

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Originally Posted by L-head View Post
The brass part that is marked ".098" looks to me like the fuel inlet/seat of off a Stromberg 97? I don't think it's a 94 Holley part.
Looks like you are correct, there is a Stromberg fuel inlet that is .098 orifice.
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Old 04-15-2020, 10:16 AM   #15
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Default Re: Holley 94 auestion

I think this is the thread insert;
https://www.stromberg-bulletin.com/s...et-thread-fix/
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Old 04-15-2020, 12:16 PM   #16
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Default Re: Holley 94 auestion

Not sure what Clive is saying by never seeing a 1/2" thread. They're all 1/2" by design.
I wonder if the fix was to take them to 9/16"

I've never had a stromberg, can I assume the thread is the same as a 94? 1/2"-20?

I'm just going by my 94 experience.

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Old 04-15-2020, 01:05 PM   #17
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Default Re: Holley 94 auestion

Quote:
Originally Posted by Mart View Post
Not sure what Clive is saying by never seeing a 1/2" thread. They're all 1/2" by design.
I wonder if the fix was to take them to 9/16"

I've never had a stromberg, can I assume the thread is the same as a 94? 1/2"-20?

I'm just going by my 94 experience.

Mart.
threads on the insert are 9/16″-18 OD. and 7/16″-24 ID. (standard).

The fuel line connection is the same as the Holley but where it threads into the carb it's 7/16. It's an expensive repair by the time you purchase the inlet, insert, proper drill and tap. Not to mention associated shipping costs.
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Old 04-15-2020, 05:40 PM   #18
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Default Re: Holley 94 auestion

My Holley 94 experiment for the day.
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Old 04-15-2020, 05:49 PM   #19
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Default Re: Holley 94 auestion

Art, are you rethreading a pipe thread to 1/2-20? To make it a face seal instead of an olive (as we call them) fitting?

I actually went out to the garage (it's nearly midnight here) to check a 94 is 1/2 -20.
I began to doubt myself.

so, if I have this right, a stromberg has a brass fitting with a 7/16 thread into the carb. This brass fitting takes the normal 1/2" "ford" nut. this is adapted into a worn out or damaged holley by threading out to 9/16 and using an insert to adapt down to 7/16 to take the brass piece robbed from a stromberg?

I can see why you're using the lathe to get you out of a mess.

Mart

edit: "standard" (UNF) for 7/16 is a 20 tpi pitch. 24 is used on weatherhead fittings like brake pipes for 1/4" tube nuts.

Last edited by Mart; 04-15-2020 at 05:56 PM.
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Old 04-15-2020, 07:06 PM   #20
Art Newland
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Default Re: Holley 94 auestion

Quote:
Originally Posted by Mart View Post
Art, are you rethreading a pipe thread to 1/2-20? To make it a face seal instead of an olive (as we call them) fitting?

I actually went out to the garage (it's nearly midnight here) to check a 94 is 1/2 -20.
I began to doubt myself.

so, if I have this right, a stromberg has a brass fitting with a 7/16 thread into the carb. This brass fitting takes the normal 1/2" "ford" nut. this is adapted into a worn out or damaged holley by threading out to 9/16 and using an insert to adapt down to 7/16 to take the brass piece robbed from a stromberg?

I can see why you're using the lathe to get you out of a mess.

Mart

edit: "standard" (UNF) for 7/16 is a 20 tpi pitch. 24 is used on weatherhead fittings like brake pipes for 1/4" tube nuts.
I think you got it!

I turned down this $3 fitting to .503 , smoothed out the threads in the carb with a .500 bit,
Added a bit of sleeve retainer and pressed it together.
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