I just wanted to pass this along. I recently put some AR Torq-Thrusts on my '68 and, like many of you have discovered, the factory studs are a bit short on thread engagement into the lug nut.
NHRA safety specs state, "thread engagement in the HEX portion of the lug nut must be equal to or greater than the stud diameter"...and that's also the general accepted industry standard for thread engagement. No big secret that modern aluminum rims are thicker in the hub area.
I really didn't want to go to the long 3" studs.
For our B-Body 1/2" studs , I used these....
A nice amount of extra length. The knurl size is slightly larger than OEM, but they pressed in just fine.
NHRA safety specs state, "thread engagement in the HEX portion of the lug nut must be equal to or greater than the stud diameter"...and that's also the general accepted industry standard for thread engagement. No big secret that modern aluminum rims are thicker in the hub area.
I really didn't want to go to the long 3" studs.
For our B-Body 1/2" studs , I used these....
A nice amount of extra length. The knurl size is slightly larger than OEM, but they pressed in just fine.