whats the underhead length for these?

2.500 or 3.250

thanks

 

From the PM I sent you:

I used the 2.67" studs available from Lingenfelter. The problem is they have more than 1/2" of unthreaded length in addition to the 2.67" of threads/knurl. The theory is the unthreaded length help you get the wheels on the studs easier. Problem is they stick way out if you ever try and put your street wheels on. If you could get a 2.75" stud, with less unthreaded length, it would be perfect, but I don't know if they are available. Check with GM Performance Parts or ARP. They both make 12mm studs with the correct knurl.