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  #16 (permalink)  
Old 07-23-2010, 06:51 PM
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negative camber question

That is real common on those frames.I corrected a 60 sedan delivery a few years ago. now is the time to do it,with the engine out.Any reputable frame shop should have the specs(distance between shim mounting surfaces).I dont have them here,but I can get them for you if needed. I simply put a 10 ton porto-power ram between the shim surfaces and spread to specs(plus a little extra for good measure.). Its a lot easier to do it now,rather than after the running gear is installed. It can be done either way, but it is a lot more work to pull it on the frame machine after it is put together.

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  #17 (permalink)  
Old 07-23-2010, 07:05 PM
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Quote:
Originally Posted by 39 chev
That is real common on those frames.I corrected a 60 sedan delivery a few years ago. now is the time to do it,with the engine out.Any reputable frame shop should have the specs(distance between shim mounting surfaces).I dont have them here,but I can get them for you if needed. I simply put a 10 ton porto-power ram between the shim surfaces and spread to specs(plus a little extra for good measure.). Its a lot easier to do it now,rather than after the running gear is installed. It can be done either way, but it is a lot more work to pull it on the frame machine after it is put together.
I hadn't thought of that, if the frame needs to be spread without the engine is the time to do it. I am thinking "wheel alignment", with that you need all the weight in. But if the frame is indeed "sagging" then now is the time to do it, good call.

But is a 10 ton porto-power really enough? Seems that frame would be stronger than that.

Brian
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Old 07-25-2010, 09:26 AM
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negative camber question

Yes,a 10 ton ram pushing straight across is plenty strong to spread the crossmember to the proper specs. We used to"jack" a lot of those GM crossmembers for camber back in the day,but we didnt usually have the convenience of having the engine removed.
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Old 07-27-2010, 12:38 AM
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Originally Posted by redsdad
I have to disagree. If you remove more shims from the front than the rear, that would move the upper ball joint rearward moving the caster in the positive direction.
correct =)
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Old 08-03-2010, 06:53 PM
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Um?? This may sound dumber then it should but are these not the same basic front end set up as my 70? i have the car lowered three ish inches up front and 2 in teh rear, after doing that the camber was so bannanas in 150km i had the inside edges at the wear bars on brand new tires...long story short, checked the control arms to see how many shims i could remove to try and get some positive camber back and hmmm, i had none, then everyone and their dog tells me about ofset control arms and ball joints and yada yada yada, turns out i just had no idea what i was talking about and my buddy tells me about the eccentric bolt at the lower control arm, put it on rack, and ten minutes later, it was straight.....it was really cool too....now this may not be relevant atall, if not good luck and sorry for wasting your time.....
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Old 08-03-2010, 08:33 PM
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no cams on a 58-64 car at all.
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Old 08-03-2010, 10:20 PM
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What 1970 are we talking about? I don't know of ANY factory GM car with an eccentric bolt/washer. Trucks have one but I honestly don't remember any vintage GM cars with one.

Brian
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Old 08-03-2010, 11:41 PM
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Quote:
Originally Posted by MARTINSR
What 1970 are we talking about? I don't know of ANY factory GM car with an eccentric bolt/washer. Trucks have one but I honestly don't remember any vintage GM cars with one.

Brian
Vega(H-body) is all I can think of besides the trucks. Nothing but the trucks in 1970 however, Vega didn't exist until '71.
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Old 08-04-2010, 07:08 AM
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Quote:
Originally Posted by MARTINSR
What 1970 are we talking about? I don't know of ANY factory GM car with an eccentric bolt/washer. Trucks have one but I honestly don't remember any vintage GM cars with one.

Brian
70 Pontiac Strato Chief (impala) , just did it last week....i had never heard of it either...
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  #25 (permalink)  
Old 08-04-2010, 04:47 PM
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Yes the 65 to 70 full size chevy's had an eccentric on the lower control arm for camber adjustment,and an adjustable strut rod to set caster.I aligned many of them back in the day.
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Old 08-04-2010, 09:09 PM
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I remember a couple 65-70 big Chevies coming in with shims. However, the proper way to adjust was with the eccentric and strut rod. I would pull all the shims out and set it right.

You can see the eccentrics and the strut rods in some of the shots on this page.

http://www.joescustoms.com/Impala5.htm
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