Originally Posted by teamo
So far I haven't seen a shim anywhere on the body mounts. The #4 on the right side has none and the #1 on the same side also doesn't look like it has any. As soon as I get access to the #2 and #3 I'll see if there are any shims at all. I tend to believe that this things has been off the frame in the past and the dimwit who did the work figured that a shim was a waste of time or something. How do I know how many shims to use if there are none to replicate?
I am no expert by no means. I only did my own frame off on my '74. I had no rust on the frame that had to be fixed, but both rear mounts on the body had to be replaced. On my car some of the shims had turned almost to dust so I almost had to start from scratch like you are.
The shims are for setting up the gaps between the doors and rear quarter panels, the doors and front fenders, and hood gap at winsheild hood surround.
Set your body down and look at your gaps
REAR DOOR GAP:
If your rear door gap is tight at the top and big at the bottom, you need shims at the rear of your door (rear bird cage)
If your door gap is big at the top and tight at the bottom you need shims at the rear mount.
FRONT DOOR GAP:
If the gap is big at the top and tight at the bottom you need shim the mount at the radiator core support
If the gap is tight at the top and big at the bottom then you need shims at the front birdcage mount (front door gap)
Now if you added shims at the front door gap you might have to add the same amount of shimes at the rear cage mount (rear door gap) and rear mount to keep the rear door gap even. This is wear you have to be patent and it will turn out.
Now all you have to do is repeat this on the other side. remember no 2 Corvettes are the same, so some mounts will need no shims and one might need 5, thats how mine was.
Hope this helps