Help with Lug Nuts for C3 Corvette Aluminum Wheels on a G-Body

FlyArmy

FlyArmy

Not-quite-so-new-guy
Feb 18, 2018
13
16
3
#1
I found a set of C3 Corvette Aluminum wheels and decided to try them on my Grand Prix. The only issue is the lug nut thread pitch for the C3 wheels is 7/16 and I need the 12mm x 1.5 thread pitch lugs nuts. The C3 uses a special type lug nut with a flat washer and not the standard acorn style that we use on our G-Body's. Has anyone encountered this problem and can you suggest a place where I can purchase them? Thanks in advance for any leads.
 
85442/86buick

85442/86buick

Master Mechanic
Feb 12, 2013
361
174
43
Toronto
#2
would the T-Type wheel nut work ? If so Kirban's ( google them ) buick turbo sells them not cheap ...but what is ?
t-type-wheel-nut-jpg.93219

 
B

buzz77

Master Mechanic
Jun 11, 2013
290
39
28
#3
You need mag shank style lug nuts. You need a shank length and diameter measurement to get the right ones. You can contact any corvette supplier and they will steer you in the right direction. Summit Racing also has numerous corvette specific shank lugs made by Dorman.
 
Last edited:
79 USA 1

79 USA 1

Master Mechanic
Sep 2, 2011
350
222
43
Cheektowaga, New York
#4
I have a set of the 76-82 Corvette aluminum wheels destined for my 88 SS when its time for tires. The lug nuts you have should look like the pair on the left in these pictures.

On the right is a McGard short shank lug nut that I am planning to run due to needing the metric thread. Here is the link to the part on Summit's web site.
I had used these lug nuts originally with my Centerline Convo Pro's.
https://www.summitracing.com/parts/mcg-60129/overview/

Hope this helps!
Bob S.
 
Bonnewagon

Bonnewagon

Geezer
Sep 18, 2009
5,449
855
113
Queens, NY
#5
Those look a lot like Pontiac snowflake wheel lugs. If so- they are available both in 7/16 and m12 thread. Fleabay has loads of them.
proxy.php?image=https%3A%2F%2Fi.ebayimg.com%2Fimages%2Fg%2FdeoAAOSwyQtVhFJF%2Fs-l64.jpg&hash=c228fe26fc813fe27b28a8059504ba1d
 
FlyArmy

FlyArmy

Not-quite-so-new-guy
Feb 18, 2018
13
16
3
#7
I went to the local Discount Tire with an original C3 lug nut and match them up. The lug nut set worked great. Here is the information if anyone else wants to experiment with Corvette Aluminum wheels. Thanks for the responses. Mike
img_3172-jpg.93313
img_3171-jpg.93314
 
Longroof79

Longroof79

Geezer
Oct 14, 2008
9,406
2,548
113
Gainesville, Fl
#8
Those wheels look great on your Grand Prix. Good choice.
 
spidereyes455

spidereyes455

Greasemonkey
Mar 6, 2013
172
56
28
Northeastern PA
#9
I always liked those wheels and I agree they look great on the GP, like they belong on it.
 

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