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Author Topic: Correct subframe bolts  (Read 5590 times)
HOGDADDY
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« on: April 25, 2010, 09:21:46 AM »

I am almost positive that I was first to unbolt my subframe and feel these are the correct bolts. There was some discussion on TC on correct bolts and I did a search here and there but found no pics.
Anyway here is a pic of mine there are no markings that I can see.
Are these the real bolts used on the assembly line?
Do all subframe bolts 67-69 look the same?
Just curious is all and does anyone reproduce the correct bolts?



Btw these are pointed on the end just can't see it.
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HOGDADDY
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« Reply #1 on: April 26, 2010, 02:11:04 AM »

Anyone?
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Hans L
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« Reply #2 on: April 26, 2010, 11:52:39 AM »

I am pretty sure those are the core support bolts, not the subframe bolts.   Subframe bolts do not have the "built-in" washer.

I have pictures of both and will try to post later.
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'69 Camaro RS Z/28 Van Nuys Built
HOGDADDY
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« Reply #3 on: April 26, 2010, 12:44:18 PM »

All 6 of mine are the same and I have them at hand also. They all have the built in washer.
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HOGDADDY
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« Reply #4 on: April 26, 2010, 03:45:05 PM »

Well I thought I had all 6 but think I may have trashed the 2 worst looking (still looking) ones so all I have is 4 that are all the same and all 4 have "built in" washers.

I am still pretty sure they all are the same anyone else have your originals?
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another kurt s
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« Reply #5 on: April 26, 2010, 07:33:31 PM »

I just bought a kit with all the bolts and body mounts.  It came with incorrect bolts but the body bolts were slightly larger than the core support bolts.  Not sure if this is how the factory did it.  The car was tore down 17 years ago so I have no idea what came off.  By the way, the kit came with six mounting bushings, two of each size.  So there are 3 different types for the subframe and core support.  I used the bolts that came with the kit and figure I can easily replace with originals if I can find them.
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Hans L
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« Reply #6 on: April 26, 2010, 08:27:09 PM »

According to the 1969 Camaro Assembly Manual, Page 41, the Core Support Bolt PN is 3914816 while the Subframe Bolt PN is 3912533.   As the PN are different, it's most likely the actual bolts are different.

I'll post pictures of mine in a little while.
« Last Edit: April 26, 2010, 08:57:24 PM by Hans L » Logged

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Hans L
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« Reply #7 on: April 26, 2010, 08:35:23 PM »

Also, if you're looking for reproductions, AMK Products appears to carry them.

Reference page 30 for 3914816 for the Core Support Bolt:  http://www.amkproducts.com/Catalog_PDF/24-38.pdf
or here's a direct link to the part:  http://www.amkproducts.com/bulk3.asp?part=B%2D10079

And reference page 23 for 3912533 for the Body Mount Bolts:  http://www.amkproducts.com/Catalog_PDF/6-23.pdf
or here's a direct link to the part:  http://www.amkproducts.com/bulk3.asp?part=B%2D10180

However, the head markings for the body mount bolts differ from what were factory installed on my Camaro which are R - B  - W not "A" as per the repo.  The "A" could be correct, but they were not used on my '69 Camaro assembled in Van Nuys.

Hope this helps.
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Hans L
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« Reply #8 on: April 26, 2010, 08:53:26 PM »

Here's pictures of my original bolts.  These were taken before I had them re-plated.  They've since been replated (black phosphate) and look brand new.

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'69 Camaro RS Z/28 Van Nuys Built
HOGDADDY
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« Reply #9 on: April 26, 2010, 09:44:43 PM »

I don't understand why I would have 4 of same I never unbolted any other first generation subframe I can see 2 core support being different as I can't find them (or know what I am looking for).
I should not have 4 of same unless they are original to my car.
Maybe 67 was different than 69.
I have a 68 AIM  and it shows a revision on the 4 body bolts and I see that the bolt numbers are different for core support now also.
The 68 AIM list same pn# you have listed also.
I wonder if 67 AIM list different numbers?

Btw I also have 8(-1) rusty washers that go with those subframe bolts too. 4- 2 7/16" size and 3 (missing 1)- 1 1/8" (these are the concave washers)

Looks like I possibly found 1 of the original core support retainers also and if thats right it looks like core support bolt could have been bigger or did it just hold washers on?



I have nos subframe bushings but probably should sell em for $$.
« Last Edit: April 26, 2010, 10:32:18 PM by HOGDADDY » Logged
HOGDADDY
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« Reply #10 on: April 26, 2010, 10:39:04 PM »

Also look at what Heartbeat City sells for correct subframe hardware, interesting. I don't know if his are correct either but looks like its missing the special washers shown in the AIM (concave ones)......... 4 large and 2 smaller bolts.

http://www.heartbeatcity.com/store/product/14475/Camaro-Sub-frame-mounting-hardware--67-68-69/
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Hans L
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« Reply #11 on: April 26, 2010, 10:48:01 PM »

I was going to say that the subframe bolts have quite a bit bigger diameter than the core support bolts.   Go try this - take one of your core support bolts and see if it screws into a body mount.  I'd bet it doesn't and that should answer the question whether your's came with all the same bolts.
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'69 Camaro RS Z/28 Van Nuys Built
HOGDADDY
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« Reply #12 on: April 26, 2010, 10:51:41 PM »

I was going to say that the subframe bolts have quite a bit bigger diameter than the core support bolts.   Go try this - take one of your core support bolts and see if it screws into a body mount.  I'd bet it doesn't and that should answer the question whether your's came with all the same bolts.

It screws into the body mount hole perfectly! There can be little doubt that it is not the right bolts imho.

Heartbeat City shows the core support bolts smaller too like you say so that couldn't be an original core retainer in pic above I guess.
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68rs327conv
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« Reply #13 on: April 27, 2010, 05:10:23 AM »

I have picked up two original sets (supposedly) from camaro owners doing restorations, and the body mount bolts for position #2 and #3 both had the captured washer as part of the bolt head.  I am curious if any original 68 owners have bolts like these on there cars?

Mike
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Mike
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Hans L
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« Reply #14 on: April 27, 2010, 10:38:48 AM »

Hogdaddy - Good deal on the fit.  Now I'm curious to what the diameter of the bolt is.  Do you know?   Is it 5/8" or 1/2"? 

It's also clear the GM used different suppliers through the years and even during the same year as the same plant.   So long it met the bolt spec, it was probably on the approved list.   
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