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post #1 of 6 (permalink) Old Jun 12th, 19, 05:55 PM Thread Starter
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John
 
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Location: Illinois
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where to start. Need help

Hi All, been a while since I've been here but lots of experiences with 1st gen's and have found lots of help here.
A friend asked me to investigate an issue with a "high end"restoration he had done. Build is a 69 SS/RS 396. Awesome build with a couple problems. The issue I'm seeking help with is that his front rims are hitting both the upper and lower control arms. Car has new Heidts tubular A arms both upper and lower with Wilwood hubs and Cooker SS 15"X7" rims with standard 4 3/8 back space. When I say they "hit" the a arms its actually an understatement. If someone hadn't adjusted the stops so they didn't hit he would have cut right through them. Of coarse now it takes a Walmart Super Center parking lot to turn around.
I can't seem to get any thoughts from Heidts and I'm at a loss as to what is wrong. I may suggest spacers for wheels but that just seems wrong. Any ideas?
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post #2 of 6 (permalink) Old Jun 12th, 19, 06:51 PM
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Don
 
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Re: where to start. Need help

Wheel diameter is likely too small for those arms. A larger diameter wheel would have more clearance to the arms. Don’t see a lot of guys running tubular control arms with 15” wheels.

At least this is my initial thought. You could try pushing the wheels out with spacers to verify.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
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post #3 of 6 (permalink) Old Jun 12th, 19, 07:14 PM
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Beth
 
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Re: where to start. Need help

Isn't this common with drop spindles ?

But usually it's just the lower control arm hitting with a drop spindle?

68 Camaro convertible, 6.0 LQ4 with LS3 heads, Vintage Air, 750 street demon carb, eddy perf rpm, GM hot cam, Hooker headers, 4L80e, 12 bolt, 3.55 gears
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post #4 of 6 (permalink) Old Jun 12th, 19, 07:26 PM
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Don
 
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Re: where to start. Need help

Quote:
Originally Posted by NashvilleCat View Post
Isn't this common with drop spindles ?

But usually it's just the lower control arm hitting with a drop spindle?
Tie rods hitting the wheel is common with dropped spindles and small diameter wheels. At least that is my understanding.

If I followed it right the OP is saying it hits both control arms. Speedtech sells high clearance upper arms.

Dropped spindles with 15” wheels would likely be a bad idea.

Don

1969 Camaro LSA 6L90E AME subframe and IRS
1969 Camaro vert LS3 4L65E Ridetech level 2 - sold
1959 El Camino project
1969 Mustang Sportsroof project
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post #5 of 6 (permalink) Old Jun 13th, 19, 03:21 AM
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Greg
 
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Re: where to start. Need help

I don't think you are supposed to run 15" wheels with Wilwood brakes either. I had my old 15" wheels and tires to make my car a roller. The 4 piston rear barely fit and the only way the front would fit was without the 6 piston caliper bolted or up front. Going up to a 17" wheel would help, but there are much better tire options if you went to a 18" wheel

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post #6 of 6 (permalink) Old Jun 13th, 19, 04:56 AM
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Bruce
 
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Re: where to start. Need help

Problems seem to arise when changes are made to good design to begin with. One thing leads to another. I try to keep the changes that make sense from the type of driving that is going to be done. Try a larger wheel and visually see where the issue is and go from there. I use the next lower spring rating that is stock on stock/poly bushing a arms to lower the front, then, 17x8 wheels and tires at stock height and have no issues and it handles great with a IROC box and larger sway bar with Gabriel or Delco shocks.
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