'66-'72 Holley 1x4 Air Cleaner Stud Photo

[Joseph S.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Mike
As info Rick Fortier reproduces the studs- He advertises in the Driveline and I have attached his email.

richfortier@chartermi.net

Joe

[Mike B.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Thanks Joe. I'll check out Richard's site again. Mike

[Rob V.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Hi--

Why not just call him?? I recently had two (2) occasions to deal with Mr. Fortier, and it really helped to be able to speak with him. Not only is he extremely knowledgeable, but he is also very accommodating and nice. Bottom Line: My dealings with Mr. Fortier were outstanding; and the positive experience was attributable to being able to discuss my needs, vice trying to conduct on-line research. For what it is worth....

[Mike B.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Good Afternoon Guys,

Resurrecting this thread for one final question on this subject.

A couple of you out there were probably thinking that I was "asking the obvious" when I started this thread about what an original '66 Holley air cleaner stud looked like? Well, mine was missing and all I had to go on were photos of installed studs. Thanks to you guys I got even more detailed photos of installed ones. And thanks to Skip Steinman who was generous enough to remove his for a close-up photo. Now I definitely know what an original stud should look like. See his stud posted earlier in this thread.

To add to my earlier confusion/curiosity of what an original one looked like I've got two friends that have slightly different studs on their '66 427 Corvettes. One friend up in Canada has owned his L36 since 1983 that still has it's original air cleaner base and lid. So why wouldn't the stud be original as well? Anyway, check out these 2 photos of 1/4 - 20 X 1 1/2" studs with their offset shank/shoulder. Not centered like Skip's original.

My friends and I would like to know if any of you out there have this type of stud? Maybe it's for '65 small block and earlier?

Wondering,
Mike & friends

Ric's '66 Air Cleaner Stud.jpgRon's '66 Air Cleaner Stud.jpg

[Jack M.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Mike- Just an observation from reviewing other Chevy AIMs from the same era (different stud numbers).
ONLY the Corvette had a NOTATION on how to install the carburetor stud (see highlighted image below).
And if you compare the TAPER on the images I presented, as well as Skips's... the taper is more pronounced.
Perhaps that taper was the key identification element for line workers, when both ends of the stud were equal.
The drop base air cleaner could also play a major roll in the exposed thread count... just some elements to consider.

Carb Stub Notation.jpg

[Mike B.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Thanks Jack,

I agree that all of the original photos that you and others shared show the pronounced tapered tip on original studs. Skip's November '65 built 1966 L36's stud clearly shows this taper. I used his photo and known measurements to purchase two from a good friend of mine who also collects and sells 1960's vintage bolts. Lucky find as these are not repros. He had these studs for a couple of decades. But they are plated in zinc. Skip's stud appears to have been plated black phosphate? I'll have to do more research on correct plating. Just glad to have these studs pictured here.

As for the two offset shank studs shown a couple of posts below, my friends wanted me to ask everyone if they'd ever spotted studs like those? Please chime in if you have. I'd like to know their origin too.

Mike

'66 Holley Studs.jpg

[Joe L.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Mike- Just an observation from reviewing other Chevy AIMs from the same era (different stud numbers).
ONLY the Corvette had a NOTATION on how to install the carburetor stud (see highlighted image below).
And if you compare the TAPER on the images I presented, as well as Skips's... the taper is more pronounced.
Perhaps that taper was the key identification element for line workers, when both ends of the stud were equal.
The drop base air cleaner could also play a major roll in the exposed thread count... just some elements to consider.

[ATTACH=CONFIG]115309[/ATTACH]

Jack-------


The reason for the instruction for the taper to be on the upper end is to facilitate the installation of the wing nut.

[Ronald L.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

A print will tell you what the finish was to be as specified by Chevrolet Engineering.

The most common finish, not plating BTW, was Phos & oil, as this is an engine part, it might have been standard phos, not the heavier black phos which was probably not invented yet, pretty sure adding Mn was a 70s thing.

Not being a chassis part, unlikely it was zinc plated. You can see that other clips in the same area were all phos.

[Jack M.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Jack-------


The reason for the instruction for the taper to be on the upper end is to facilitate the installation of the wing nut.

Joe- What you mention is totally understood. What isn't understood, is WHY the notation is ONLY present in the 66 Corvette AIM?
I was simply attempting to give a semi-plausible 'guess' for that notation (perhaps there was an issue in 65).

Below is a list of carb studs from several AIMs I have... that notation was NOT found elsewhere.
It also appears this particular stud (3873852) was fairly unique to the BB engine:

1963 Corvette - 3777266
1964 Corvette - 3777266
1965 Corvette - 3777266 (SB)
1965 Corvette - 3873852 (BB)
1966 Corvette - 3873852 (SB - BB)
1967 Corvette - 3873852 (SB - L36)
1967 Corvette - 3869954 (L71 - L88)

1967 Camaro - 3901834 (6)
1967 Camaro - 3921975 (L30 - L35)
1967 Camaro - 3873852 (BB)

1963 Nova - 5649855 (6)
1963 Nova - 3756988 (L30)
1963 Nova - 3750992 (L32)
1965 Nova - 3789362 (6)
1965 Nova - 3750992 (8)
1965 Nova - 3756988 (L30)

1963 Passenger - 3771415 (6)
1963 Passenger - 3750992 (8)
1963 Passenger - 3756988 (L30 - L74)
1963 Passenger - 3718921 (L80)
1964 Passenger - 3789362 (6)
1964 Passenger - 3750992 (8)
1964 Passenger - 3756988 (L30 - L74)
1964 Passenger - 3718921 (L80)
1965 Passenger - 3789362 (6)
1965 Passenger - 3750992 (8)
1965 Passenger - 3756988 (L30 - L31 - L74)
1965 Passenger - 3869954 (L35 - L78)
1966 Passenger - 3789362 (6)
1966 Passenger - 3750992 (8)
1966 Passenger - 3864802 - 3869954 (OPT) - (L30)
1966 Passenger - 3869954 - 3864802 (OPT) - (L35)
1966 Passenger - 3869954 (L72)
1966 Passenger - 3756988 (L77)
1967 Passenger - 3901834 (6 - 8)
1967 Passenger - 3921975 (L30 - L35)
1967 Passenger - 3869954 (L68)
1967 Passenger - 3873852 (L72)

Perhaps someone else has more AIMs, or a better guess for the notation.

[Ronald L.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Jack,
Good to see you are on top of these fine details, hope all is well with you.

On this one, the details are missing in the AIM, unless you had an original copy of the first issued 66 aim from the spring/ summer of '65.

Reason is that 11-18-65 there were updates and part of that views and parts removed, just by reading the change block, that documents this.

The fact it was not there in '65, let's think about that, the BB started in March say. They would have had limited Dealer feedback, and it would have been After the 66 aim was already written. I see from looking at page F379 that there were so many changes, that some of the prior info is not lost, unless you had a copy of earlier versions.

Why a BB thing, again, let's talk about Mark IV engine introduction, 65 MY there were few, Corvette and Impala. That was the beginning of the open air filter assembly, that some people have pieces of prints from, enough so, that I wish I had what they don't have which is a separate discussion...

Its perfectly understandable that the BB engine had its own parts, I owned a 66 BB a very long time ago that had its' hood pierced with a smart replacement...

That car, I restored by the way by pulling prints, reading what the GM engineer put On the Print, painted/ plated mostly... and then the prints went back in the mirofiche file, what one would pay to have that file case these days... better than all the hopium and cad plating in the world.

[Jack M.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Hey Ron- Nice to have you chime in... hoping thingz are going well for you.
Unfortunately, all my 60s era AIMs are simply poor copies... I'd love to have some originals.
Even if I did, I'm guessing it would be extraordinarily rare to have the initial/outdated pages...
As the updates/revisions came in, I believe they were told to REPLACE the existing pages.
And if there were any 'singular' updates to the page in question, several 'old' pages could exist.
There are other early 66 AIM pages that I seek, but I have a better chance of winning Mega Millions.

[E S.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Ron-Hard to tell what the finish is on mine- seems to be dark though.
E.J.IMG_20230116_151119590.jpg

[Gary B.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Thought I would post 68-72 stud part numbers.

68-69 Quadrajets 3921975
Holley, L71 3928912
Holley, L88 3869954
70-72 Quadrajets 3921975
Holley, LT-1 3873852
Holley, LS-6 3873852
These numbers came out of the 68 through 72 AIM's.

Gary Bosselman

[Mike B.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Thanks Gary. Excellent info. If you get the chance would you be so kind as to check if '68-'69 small blocks and L36 Vettes have the #3873852 stud? If they're Q-Jet disregard the request. Mike

Thought I would post 68-72 stud part numbers.

68-69 Quadrajets 3921975
Holley, L71 3928912
Holley, L88 3869954
70-72 Quadrajets 3921975
Holley, LT-1 3873852
Holley, LS-6 3873852
These numbers came out of the 68 through 72 AIM's.

Gary Bosselman

[Terry M.]

Re: '66-'72 Holley 1x4 Air Cleaner Stud Photo

Thanks Gary. Excellent info. If you get the chance would you be so kind as to check if '68-'69 small blocks and L36 Vettes have the #3873852 stud? If they're Q-Jet disregard the request. Mike

Mike
68-69 small blocks and L36 are Quadra Jet.