Upper control arm shims - Team Camaro Tech
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post #1 of 6 (permalink) Old Jul 31st, 18, 06:38 PM Thread Starter
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Frank
 
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Upper control arm shims

I looked at a 68 tonight that had at least an inch thick of spacers on the upper control arm bolts.. this can't be normal.. Do you think it was wrecked? twisted?
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post #2 of 6 (permalink) Old Jul 31st, 18, 06:43 PM
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Yes, or just worn out. My car only has 2 shims in it. And they are both on the drivers side. Pretty thin, probably doesn't even need them.

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post #3 of 6 (permalink) Old Jul 31st, 18, 07:30 PM
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Re: Upper control arm shims

If he was targeting negative camber and more caster than factory specs it is possible. Without knowing the alignment specs itís difficult to make any assessment.

Is the car a stock restoration or a restomod?

Don

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post #4 of 6 (permalink) Old Aug 1st, 18, 07:40 AM Thread Starter
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Re: Upper control arm shims

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Originally Posted by dhutton View Post
If he was targeting negative camber and more caster than factory specs it is possible. Without knowing the alignment specs itís difficult to make any assessment.

Is the car a stock restoration or a restomod?

Don
Original 6 cyl car someone stuffed a 454 in .. not a show or race car..
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post #5 of 6 (permalink) Old Aug 5th, 18, 07:19 AM
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Re: Upper control arm shims

Quote:
Originally Posted by Just 1 More View Post
I looked at a 68 tonight that had at least an inch thick of spacers on the upper control arm bolts.. this can't be normal.. Do you think it was wrecked? twisted?
Not sure what direction the camber would go if you pulled a light 6 cyl out and dropped a heavy big block on the original springs but maybe that is why. If he was looking for negative camber and maximum caster there should be a large stack on the rear bolts and few or none on the front.
Quote:
Originally Posted by X-77 keith View Post
Yes, or just worn out. My car only has 2 shims in it. And they are both on the drivers side. Pretty thin, probably doesn't even need them.
What typically happens on these cars as they age is the frame bend inward at the top or sag if you want to call it that. If you are running factory specs to correct camber you remove shims to compensate for this sag. NO shims is not a good thing IMO and those two thin shims are in there to make your specs as good as they can be.

Jeff
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post #6 of 6 (permalink) Old Aug 5th, 18, 08:32 AM
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Re: Upper control arm shims

Something a lot of people don't realize is the L6 was a heavy engine at 630lbs. The small block with iron heads and intake is 575lbs. The big block with iron heads and intake is 665lbs. Typically loading the suspension moves the camber out (positive) depending on where the upper control arm is in its arc. Swapping an BB for a L6 is not going to change camber much but it will effect it slightly most likely in the positive direction requiring shims to pull it in (negative). In the early 70's everyone wanted to raise their cars. Not drop them as is typical today. A common spring swap for a SB was to use 6 cyl. springs. Sometimes with the addition of a 3/8" spacer depending on the car.

Al

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