I have a question for you guys with 15" X 3.5" Draglites. I'm using 5/16 spacers and ARP 12mm X 1.5 studs that are 2.5" long with Weld SST 12mm X 1.5 open end lug nuts. The problem is the studs still don't protrude into the hex portion of the lug nut like the NHRA mandates. Is this how your set-up is? Have you had any trouble with tech?

------------------
SSEE YA,
Mike Glick
97 SS #2476
12.678@110.49
383 in the works!

 

I am using the Weld prostars with the 5/16" spacer also. I was going to use the 12mm ARP studs but didn't think they were long enough, so I then ordered some of the GM performance parts long wheel studs and they have exactly the same amount of threads but have a smaller diameter non threaded tip. I then ordered some 1/2"-20 studs that are 3" long and they have the exact same layout as the GM performance parts studs. So now I am not sure what I am going to do.

HTH.


------------------
Chad Beebe
'97 T/A WS6 M6 Dark Metallic Green
CC 306 cam and some other stuff.
My Car

12.762@109.13 with 1.828 60'
Best 60' 1.816

 

Grover, are the 1/2"-20 studs screw in, or do they have a knurl? I have 1/2"-20 for the rear since my Strange 12 bolt takes 1/2" screw in studs. I'm thinking of getting my front hubs drilled and tapped for 1/2"-20 screw in studs, but then I have to buy some more 1/2-20 lug nuts.

------------------
SSEE YA,
Mike Glick
97 SS #2476
12.678@110.49
383 in the works!

 

The ones that I bought are press in but I believe that ARP makes screw in studs.

BTW I called ARP to see if they would make the 12mm studs in a 3" length and for 20 of them it was going to cost me $670 and for 40 it would have been $750.

 

Where did you find 1/2"-20 X 3" press in studs? Is the knurl the proper size for the 4th Generation F-body? The only 1/2"-20 X 3" stud s that I have found are the screw in type.


------------------
SSEE YA,
Mike Glick
97 SS #2476
12.678@110.49
383 in the works!

 

You can always drill out the axle for a larger knurled hole. If they don't make one to fit the current hole just buy the next size up. They come with instructions as to the size of the hole to drill. Drill the hole at least one size smaller though.

I run 7/16 x 2 1/2" on the front with weld draglites and no spacer. There's enough thread to go into the nuts. 1/2 x 3 are on the rear.

It's usually easier to find the studs and cheaper to convert to standard thread instead of using the 12mm studs.

------------------
Stephen's racing page
or check out the race car

87 IROC SuperPro race car
461 big block
Best ET on a time slip: 11.589
Best MPH on a time slip: 116
Best corrected ET: 11.079

Altitude corrected rear wheel HP: 468
Best 60 foot: 1.617
Member of the Calgary Drag Racing Association

 

Unfortunately, I already bought the 12mm studs and lug nuts, and then found out they are not long enough. At least according to the NHRA they are not long enough. Since I've already purchased them, it's gonna cost extra no matter how I do it. I'm probably gonna order 1/2-20 screw in's and just drill and tap the hubs.



------------------
SSEE YA,
Mike Glick
97 SS #2476
12.678@110.49
383 in the works!

 

Mike,

The press in ones that I bought are for a Speedway Drum brake axle because the knurl diameter for these is 0.568" whereas the knurl diameter for the 12mm studs is 0.509". I am just going to go with the 12mm studs all the way around. I might just mill the spacers thinner for the front so they will be legal.