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How low is too low on stock bolts?

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Old May 13, 2026 | 08:18 PM
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Default How low is too low on stock bolts?

I have an autoX toy C5 and I'm trying to get the back lower. I took a turn and a half out of the rear bolts, but I'm wondering if I can get more. It's getting a little sketchy though.



I think the top of the threads are just about at the top of the nut, but I noticed that the nut isn't actually threaded all the way - the top is actually beveled inwards.

What's the peanut gallery think? Is this as far down as I can go?
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Old May 14, 2026 | 11:11 AM
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Use a Witness Paint Line. At Least

Or get longer grade 8's

And a Jamb nut

Or Go Full Kustom:

Style Points for Drilled AN Hardware and a Legit Retainer

Castle nut and cotter pin

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Old May 14, 2026 | 11:22 AM
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NHRA specs for lug nuts is that the diameter of the stud much project into the nut. Seems like a good rule of thumb.

IMHO you can get a rear lowering kit for $60 - it's not worth taking a risk
https://www.westcoastcorvette.com/pr...97-2004-c5-z06
Yeah, you can find bolts for cheaper, but having all of the bushings etc in one spot sure makes this easy.
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Old May 14, 2026 | 02:05 PM
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Originally Posted by Lowend
NHRA specs for lug nuts is that the diameter of the stud much project into the nut. Seems like a good rule of thumb.

IMHO you can get a rear lowering kit for $60 - it's not worth taking a risk
https://www.westcoastcorvette.com/pr...97-2004-c5-z06
Yeah, you can find bolts for cheaper, but having all of the bushings etc in one spot sure makes this easy.
SCCA street class. Not allowed to replace bolts.

The witness mark is a good idea.
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Old May 14, 2026 | 04:58 PM
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Ah yes, SCCA Solo II street rules...
It's just fine to install a $4000 set of triple adjustable shocks, but don't replace simple hardware...
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Old May 15, 2026 | 01:01 AM
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Based on the pics you posted, I wouldn't go much further. You MIGHT be able to get away with another quarter turn MAX, and a quarter turn wouldn't really lower you enough to be worth the risk in my opinion. If your class allows it, coilovers would definitely get you lower.
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Old May 16, 2026 | 12:54 PM
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Originally Posted by Lowend
NHRA specs for lug nuts is that the diameter of the stud much project into the nut. Seems like a good rule of thumb.
5 threads closest to the nut/hole in any length bolt effectively hold all the tension.
"Each thread will hold half of what the first thread holds. So one thread will hold 100% of the weight if one is engaged. When two is engaged first thread holds 66,6% of the weight and second holds 33,3% of the weight

At three threads the loading is 58% and 28% and 14%.

Adding more will converge to the point where first holds 50% and the rest is spread out."

Last edited by CFight; May 16, 2026 at 01:16 PM.
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