How much wheel stud poking through do I need?

[diesel25lrs]

So I have a wilwood setup with 1/2 x 20 studs. I'm running 3 piece custom wheels with a fairly thick hub pad. The backs seem to be fine with about 1" of thread sticking out past the conical nut hole. The fronts seem to be to short though- maybe 1/2" sticking out? should I switch them out for longer studs on the front as they will be getting a thrashing?

[Bryce]

If its a conical seat than two threads past teh lug nut.

If its a shank style then the stud has to go half way into the hex part of the lug nut, per NHRA rules.

[ProdigyCustoms]

Our general rule is as much thread engagment as the stud is thick, so about a 1/2, which is 7 turns on a 1/2 X 20 stud

[Bryce]

Our general rule is as much thread engagment as the stud is thick, so about a 1/2, which is 7 turns on a 1/2 X 20 stud

Frank wouldn't that be 10 turns on a 1/2-20. 20 threads per inch.

[diesel25lrs]

Thanks guys- this gives me alot better idea & i may be able to use what i have!