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Old 10-16-2007, 08:17 PM   #1
SMYDA
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C3 Frame Specs

I had a fellow forum member ask me if I had access to frame specs for a C3.

I thought I did not have any..........but I was caught up for a little while today
and started digging through some boxes at work that had all our old "printed"
frame specs. We're all Computerized / Laser these days.

To my surprise I found Printed Specs for the '79 thru '82 model years.
I just happen to have the '69 specs in another book at home.

Thought I would post a couple examples since the over-all dimensions of the C3
are all basically the same. The biggest variation between these pages is due to
who was taking the measurements that given year.
So I would recommend that you view these as a guide and not as GM Blueprints.

These should serve as a good "reference" for ALL model C3s.


This first photo is a guide to the use of the specs:


1969 Model specs as per GM manual:


1979 Model specs: (From frame spec book)


1981 Model specs: (Note how they are not as detailed as prior year, Rrrrrrr!)
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Old 10-16-2007, 08:53 PM   #2
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My only comment is....my '72 OEM printing chebby shop manual for the car line gold and red on page 2-7 frame section shows the vette frame with the exact same as your measures....for your '69....except the front most measure as 14 and 3/8, and the rear most at 23 and 1/2 to the ground....

the rear seems a bit changed, but the front is well within tolerance, I would say...the specs on the plat/layout from on top are the same....

the other elevations are identical....

I have measured my car to those specs listed in my manual...my front is 1.5 inches lo, and the rear is stock height....

should I jack up the rear???

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Old 10-16-2007, 09:05 PM   #3
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As I stated earlier......use this as a guide and not a Blueprint.

Even with the $20,000 Computerized / Laser systems we use today
there are still errors. The most common ones I run into are with "Datum".
I will pull a car to the specs the computer gives me....then I double check
by hanging sheet metal. If the two methods conflict......the sheet metal
always has final-say-so.

If measurements are equal from side to side........meaning one frame horn
is not higher or lower than the other and body gaps are good....leave it alone.

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Old 10-17-2007, 01:51 PM   #4
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Many thanks for posting these images. I've been looking for this sort of thing for years without any luck until now.

I don't need them in the need-to-fix-my-mangled-frame sense, but this is the kind of data I routinely squirrel away for safekeeping.

Good stuff.
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Old 10-17-2007, 02:55 PM   #5
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Quote:
Originally Posted by 45 Auto View Post
Good stuff.


Good post!

Thanks for the info!

I also "stuck" it for ya!
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Old 10-17-2007, 05:53 PM   #6
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Just a note to those that may not be aware of this.............

If you have a GM shop manual for your given model year this info "should" be in it.
How detailed it will be I can not say............note the '69 example from
a GM manual does not show lower ball joint specs. Where as the Tru-Way
specs do. (They are not shown in my '81 GM manual either.)

Also note that starting in 81 Tru-Way also gave the measurements in Millimeters
as well as Inches.

Last edited by SMYDA; 10-17-2007 at 08:25 PM.
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Old 10-17-2007, 08:56 PM   #7
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ooooh, very cool. So now in 7 years when I go to have a tube frame made up I'll know where to line up all the body mounts and whatnot. I like it.
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Old 01-18-2008, 01:40 PM   #8
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Awesome! I need these to fix my mangled frame kind of mess
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Old 01-18-2008, 01:44 PM   #9
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Quote:
Originally Posted by realc3blues View Post
Awesome! I need these to fix my mangled frame kind of mess
Better send for your FREE GM restoration package.
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Old 01-19-2008, 02:10 PM   #10
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Old 01-20-2008, 03:56 PM   #11
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good thread
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Old 01-21-2008, 03:02 PM   #12
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Thumbs up! C3 Frame Replacement

Any idea how hard to replace 79 frame with 1980? My frame is damaged and I found a good rolling chassis from a 1980 at a good price.

Last edited by rtaglia; 01-21-2008 at 07:25 PM.
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Old 01-22-2008, 08:03 PM   #13
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The '80 model has the bat wing rear end set up were the '79 does not.....
other than that it shouldn't be any big deal.
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Old 01-23-2008, 08:59 PM   #14
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Regarding the '69 frame/drawing, has anyone ever seen any official measurements of the engine mount offset (to the right), and also are the slots in the trans crossmember offset to the right by the same amount as the motor mount horns?

thanks,
Mike
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Old 03-05-2008, 12:48 AM   #15
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hi to all my name is thomas. first thanks for the pics are very good.. im studing how to modify a c3 structure....so normal chassis structure how much are strong, you know whats the limit... maybe a 509 merlin block with 9.5 compression a good th400 and a low traction rear end gear maybe a 3,08 or 3,36....with 550 horsepower and no more than 500 lbs. of torque.... that is a good combination i think to take your vette to the limit , or not? can i put the limit lane more higher without flex or crash my vette structure....?

thanks to all for your help
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