C-3 intake manifold bolts

[D S.]

I have been reading archived posts and viewing photos of various headmarks such as F, M, NAT on intake manifold bolts. Photos of original bolts show non-flanged heads with tapered edges but reproductions show flanged with recessed heads. Did original bolts use lock washers? Where might one truly find original style intake manifold bolts? I have the LS-5 engine.

Thanks,
Scott Sims
Texas Chapter

[Thomas H.]

Re: C-3 intake manifold bolts

Check this thread. Has some good info.

https://www.forums.ncrs.org/showthre...ghlight=intake

Tom

PS: No lockwashers

[D S.]

Re: C-3 intake manifold bolts

Check this thread. Has some good info.

https://www.forums.ncrs.org/showthre...ghlight=intake

Tom

PS: No lockwashers

Thanks for that. While I recognize that there was no consistency of specific ones being installed this is the thread that confused me after seeing other photos of members intake manifolds including Terry McManmon's original intake. His are recessed flanged head but photos in the thread below aren't.

https://www.forums.ncrs.org/showthre...manifold+bolts

[Terry M.]

Re: C-3 intake manifold bolts

Thanks for that. While I recognize that there was no consistency of specific ones being installed this is the thread that confused me after seeing other photos of members intake manifolds including Terry McManmon's original intake. His are recessed flanged head but photos in the thread below aren't.

https://www.forums.ncrs.org/showthre...manifold+bolts

My intake manifold fasteners (and there are 7 different head marks/styles) are not going to help you much. Your engine was assembled in Tonawanda New York and mine in Flint Michigan. Any similar fasteners is just a coincidence.

[Thomas H.]

Re: C-3 intake manifold bolts

The ones on my original 71 LS5, early sept 70 build have the recesses head with flange as well as a "standard" head with no flange on the lift bracket and plug wire holders.

I believe this is the same config as Terry was talking about

I'll double check this when I get home............

Tom

[D S.]

Re: C-3 intake manifold bolts

So, if I get as many variations of 454 intake bolts as there are holes I would be totally correct. Thanks, Terry.

[D S.]

Re: C-3 intake manifold bolts

The ones on my original 71 LS5, early sept 70 build have the recesses head with flange as well as a "standard" head with no flange on the lift bracket and plug wire holders.

I believe this is the same config as Terry was talking about

I'll double check this when I get home............

Tom

Thanks, Tom. I appreciate it.

[Monte M.]

Re: C-3 intake manifold bolts

Scott,
I have been working on the same thing for quite a while now.

I have a number of different bolts that were used and I have seen some very original cars with different bolts that have never been mentioned before at all.

As you know, my car is a 72, so that is what I have focused on. I will send you some pictures to your regular e-mail.

I will do my best to tell you what I have been told. The problem is, every time I talk to another person, I quite often hear something new.

Good luck on this one.

I know a guy that just bought a very original 72. I have not found anything not original to the car, but we are just beginning.
He was going to start a restoration on the car, but I think at this point he is just going to clean it up a bit. From the outside the car is really nice.
The rest of the car looks like it has been used the way it was supposed to be.

Monte

[D S.]

Re: C-3 intake manifold bolts

Scott,
I have been working on the same thing for quite a while now.

I have a number of different bolts that were used and I have seen some very original cars with different bolts that have never been mentioned before at all.

As you know, my car is a 72, so that is what I have focused on. I will send you some pictures to your regular e-mail.

I will do my best to tell you what I have been told. The problem is, every time I talk to another person, I quite often hear something new.

Good luck on this one.

I know a guy that just bought a very original 72. I have not found anything not original to the car, but we are just beginning.
He was going to start a restoration on the car, but I think at this point he is just going to clean it up a bit. From the outside the car is really nice.
The rest of the car looks like it has been used the way it was supposed to be.

Monte

Monte, I advise people who have never reached their pinnacle of stress to attain that by having their Corvettes judged.

[Monte M.]

Re: C-3 intake manifold bolts

Here are some of them

Enginepullinghardwareadj.jpgIntakewith3radiousandRectangleadj.jpg

[Monte M.]

Re: C-3 intake manifold bolts

Here is a few more.

Monte


IntakewithFPadj.jpgIntakewithS2adj.jpg

[Thomas H.]

Re: C-3 intake manifold bolts

From my 71 LS5 mentioned earlier. Three types of bolts, flange head, recessed flange head (shielding brackets) and standard head (lifting bracket).

Mind you, this is a non-judged car, but I was the first one in the engine. (I know the dist hold down bolt is not correct, that one got misplaced..................)

TomP7180545.jpgP7180543.jpgP7180542.jpgP7180538.jpg

[D S.]

Re: C-3 intake manifold bolts

From my 71 LS5 mentioned earlier. Three types of bolts, flange head, recessed flange head (shielding brackets) and standard head (lifting bracket).

Mind you, this is a non-judged car, but I was the first one in the engine. (I know the dist hold down bolt is not correct, that one got misplaced..................)

Tom[ATTACH=CONFIG]47324[/ATTACH][ATTACH=CONFIG]47325[/ATTACH][ATTACH=CONFIG]47326[/ATTACH][ATTACH=CONFIG]47327[/ATTACH]

Thanks for replying with photos. I have I unpainted aluminum 'A' headmark non-flanged bolts on my intake. Thanks to all who responded.

Scott

[D S.]

Re: C-3 intake manifold bolts

Reviving this thread. I stated that my intake bolts were aluminum but they are not. They are zinc plated something. A source sent me photos of original 'A' headmark bolts ('A' within a circle), shaved head with built in washer. They appear to be zinc plated. Is that correct? I mean, they are going to be painted orange anyway.

[Joe L.]

Re: C-3 intake manifold bolts

Reviving this thread. I stated that my intake bolts were aluminum but they are not. They are zinc plated something. A source sent me photos of original 'A' headmark bolts ('A' within a circle), shaved head with built in washer. They appear to be zinc plated. Is that correct? I mean, they are going to be painted orange anyway.

Scott-----


You'll look a long while on a Corvette before you find an aluminum bolt. I can't think of a single application for an aluminum bolt on a Corvette. Aluminum bolts are a very specialty item. ALL manifold bolts on Corvettes are steel.

On small blocks, GM generally used black phosphate-finished manifold bolts for engines with cast iron manifolds (i.e. to be painted) and zinc plated for those with aluminum manifolds. For big blocks, I'm not sure if the same practice was used. However, as you mention, it's really a moot point. Engines with cast iron manifolds will have the bolts painted.