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04-13-2020, 06:07 PM | #1 |
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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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04-13-2020, 06:28 PM | #2 |
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Re: Holley 94 auestion
another pic
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04-13-2020, 10:18 PM | #3 |
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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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04-13-2020, 10:27 PM | #4 |
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Re: Holley 94 auestion
Any idea where I could get another?
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04-14-2020, 08:27 AM | #5 |
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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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04-14-2020, 09:58 AM | #6 |
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Re: Holley 94 auestion
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04-14-2020, 10:34 AM | #7 |
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Re: Holley 94 auestion
I thought helicoils were stainless. That looks to be a brass insert of some kind. Keensert?
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04-14-2020, 10:46 AM | #8 |
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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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04-14-2020, 10:55 AM | #9 |
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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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04-14-2020, 11:02 AM | #10 |
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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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04-14-2020, 11:28 AM | #11 |
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Re: Holley 94 auestion
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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04-14-2020, 03:29 PM | #12 |
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Re: Holley 94 auestion
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04-14-2020, 03:54 PM | #13 |
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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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04-14-2020, 09:13 PM | #14 |
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Re: Holley 94 question
Looks like you are correct, there is a Stromberg fuel inlet that is .098 orifice.
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04-15-2020, 10:16 AM | #15 |
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Re: Holley 94 auestion
I think this is the thread insert;
https://www.stromberg-bulletin.com/s...et-thread-fix/
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04-15-2020, 12:16 PM | #16 |
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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. Mart. |
04-15-2020, 01:05 PM | #17 | |
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Re: Holley 94 auestion
Quote:
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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04-15-2020, 05:40 PM | #18 |
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Re: Holley 94 auestion
My Holley 94 experiment for the day.
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04-15-2020, 05:49 PM | #19 |
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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. |
04-15-2020, 07:06 PM | #20 | |
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Re: Holley 94 auestion
Quote:
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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