_JB_

iTrader: (33)

I currently added some hub and wheel centric 3mm spacers on the rear of my car, and I'm wondering how safe it would be. I can get almost 10 full lug rotations after torquing the rims down, and the studs are ARP. The car will not be seeing any track (or hard street) time so I don't believe I'd be stressing them much.

Since the car is just a cruiser, I'm wondering if the work would be necessary. I've searched and other sites refer 6+ lug rotations are fine, but none of those sites were F-body related. So what say ye Ls1tech?

69TA

iTrader: (263)

with out seeing what 10 rotations equals to in length on a stud
imo, you should be fine, even if you took it to the track

arp studs are stronger than stock and all the ones I have seen
are a least a little longer than the stock crappy gm ones.

also 3 mm is nothing, it's about the thickness of a washer.

LS1-IROC

iTrader: (4)

I'm confused...so are you saying you snug the lugs down with a wrench and then when you torque them to spec it takes 10 full rotations to be fully tight? Or are you saying you only get 10 full turns from when you start to thread the lug on the stud before it's torqued to spec?

_JB_

iTrader: (33)

Start to thread the lug to torqued spec is almost 10 rotations. I hand tighten the lugs as far as they will go and then torque them down.

LS1-IROC

iTrader: (4)

Ok gotcha. That makes more sense. What is the thread pitch of your studs? That will tell you how much thread engagement you have to know if it's safe.

_JB_

iTrader: (33)

The stock lugs work, so I think they are 12mm x 1.5?

Furious1

iTrader: (1)

I ran spacers on the stock wheels in the back to push them out a bit. Never had any issues, but I did have similar concerns at first.

thunderstruck507

iTrader: (18)

I've always heard you want to have at least as much thread engagement as the thickness of the bolt.

LS1-IROC

iTrader: (4)

Yep...that is correct. An M12 needs 12mm of thread engagement to be 100%. An M12 x 1.5 stud that means 8 full turns to full engagement.

_JB_

iTrader: (33)

Thanks everyone! I drove the car about 30 miles this past weekend and everything appears to be ok so far.