67 carb stud

[Don M.]

I was told that the stud in my carb that holds my air cleaner is not correct. I have a universal stud. Can someone describe to me how to tell an original from a repro? It's a 67 435hp. Thanks

[David L.]

Re: 67 carb stud

I was told that the stud in my carb that holds my air cleaner is not correct. I have a universal stud. Can someone describe to me how to tell an original from a repro? It's a 67 435hp. Thanks

Don,

I have a large collection of original GM air cleaner studs that I have collected over the last 30+ years. I have an original 2 5/16" long stud (1/2" and 1 3/4" thread lengths) that MIGHT be GM # 3869954 but it also could be GM # 3901834. According to the 67 AIM the L71,L68, and L88 used stud # 3869954.

The links below show reproduction 3869954 studs by 2 different companies - AMK (part # B-11058, black phos.) and Paragon (part # 1653, cadmium plated)). I do NOT know which one is correct for your 67 435 HP. My original 2 5/16" stud mentioned above looks like the one made by AMK.

Dave

http://www.amkproducts.com/bulk2.asp?code=7430&title=Studs+-+Round+Collar

https://www.paragoncorvette.com/p-353901-air-cleaner-stud.aspx

[Ridge K.]

Re: 67 carb stud

I was told that the stud in my carb that holds my air cleaner is not correct. I have a universal stud. Can someone describe to me how to tell an original from a repro? It's a 67 435hp. Thanks

Don, I have what I am pretty sure in the original stud removed from my 43,000 mile '67 400hp car.

Unfortunately, I don't know which stored box it is in. I will try to find it within the next 24 hours.
If others can provide pics and measurments also, if would be a good comparison study.

My car definitely had it's original Holley tri-power carbs, and original air cleaner. I'll bet that stud was original......

Ridge

[Mark D.]

Re: 67 carb stud

This is a common Holley carburetor stud...

[Don M.]

Re: 67 carb stud

Thanks guys, only NCRS guys would take the time to look this stuff up on a holiday weekend. My stud is 2.00" OAL It sticks beyond the aircleaner by quite a bit. A stud that was 5/16th of an inch longer would really protrude above the air cleaner, does that sound correct?

[David L.]

Re: 67 carb stud

Thanks guys, only NCRS guys would take the time to look this stuff up on a holiday weekend. My stud is 2.00" OAL It sticks beyond the aircleaner by quite a bit. A stud that was 5/16th of an inch longer would really protrude above the air cleaner, does that sound correct?

Don,

I believe that the dimensions of the AMK 3869954 stud (2 5/16" OAL) are wrong as my 1967 Chevrolet Parts Catalogs (April 1967 & July 1967) describe the 3869954 stud in Gr. 3.403 as follows: "STUD, air cleaner and silencer........(1/4-20-20 X 2)".
According to Chevrolet Parts History GM # 3869954 was discontinued in March 1973.

Dave

[Mark D.]

Re: 67 carb stud

The stud pictured above is from my 69 L89 and is 2" from tip to tip. I am currently restoring a 67 L71 and the carb stud is the same.

[David L.]

Re: 67 carb stud

The stud pictured above is from my 69 L89 and is 2" from tip to tip. I am currently restoring a 67 L71 and the carb stud is the same.

It appears to me that the 2" stud pictured above is GM # 3869954. The thread lengths appear to be 1/2" and 1" (or maybe 1 1/16") based on counting the number of threads as there are 20 threads/inch (1/4"-20).

Dave

[John M.]

Re: 67 carb stud

All of the correct studs I have had have had Rolled threads that are larger diameter the the stud shaft, the threaded part that goes into the carb is .500 long the beveled out part that seats against the carb is .060 - .065 thick, the upper threaded part is .400 and the rest is not threaded, the tip comes to a blunted tip thats dished on the top, in 1963-4 some chevrolet 194 - 230 six cylinder novas used the same stud, they also used the 396 427 style oil cap.......John

[Mark D.]

Re: 67 carb stud

I'm sure the 67 guys will chime in but, in the meantime, I would say the stud I pictured is but one example of an acceptable original.

I judge 68-72 and, where Holleys are concerned, there is one more configuration I would say is/was original equipment. There may be more but I've only seen two that I'm comfortable with.

Regards,

Mark

[David L.]

Re: 67 carb stud

All of the correct studs I have had have had Rolled threads that are larger diameter the the stud shaft, the threaded part that goes into the carb is .500 long the beveled out part that seats against the carb is .060 - .065 thick, the upper threaded part is .400 and the rest is not threaded, the tip comes to a blunted tip thats dished on the top, in 1963-4 some chevrolet 194 - 230 six cylinder novas used the same stud, they also used the 396 427 style oil cap.......John

John,

My 1963 Chevrolet AIM lists GM # 3771415 as the air cleaner stud for the 6 cyl. engine. GM # 3771415 is described in my 1963 Chevrolet Parts Catalog (Oct. 1962) as 1/4-20-20 X 2.

My 1964, 1965, and 1966 Chevrolet AIM's list GM # 3789362 as the air cleaner sud for the 6 cyl. engine. GM # 3789362 is described in my 1964 Chevrolet Parts Catalog (Oct. 1963) as 1/4-20-20 X 2 39/64 (0.61" longer).

As stated previously GM #3869954 is described as 1/4-20-20 X 2 in my 1967 parts catalogs.

GM # 3771415 and GM # 3869954 are dimensionally the same (1/4-20-20 X 2). I do not know the difference between the two. It may be the thread length on the top end. GM # 3771415 was discontinued in May 1969 and replaced with GM # 3869954 as per Chevrolet Parts History.

Dave

[William L.]

Re: 67 carb stud

Here's is a couple of pictures of the original stud that is in my June 67 435
It is the same as the one that Mark has pictured including the shape & indentation of the the tip.

[Dick W.]

Re: 67 carb stud

Here's is a couple of pictures of the original stud that is in my June 67 435
It is the same as the one that Mark has pictured including the shape & indentation of the the tip.

Good example showing rolled threads. Notice the peak of the thread is not sharp like cut threads.

[Don M.]

Re: 67 carb stud

well, thanks guys. I appreciate all the effort. I think I will now recognize a real one when I see it. I'll keep looking for a real one, in the meantime I 'll try to pickup a close repro.. Thanks, Don

[Mark D.]

Re: 67 carb stud

Richard Fortier makes an excellent repro.