[Hyper4mance2k]

The Buddy Club ball joints seem to scrape in all setups without modification. The amount you need to grind off varies by car, by how much camber you're running, and where you're adding camber.

Adding camber with the strut bolt adds much more clearance since you're actually moving the hub in relation to the lower control arm, instead of adding camber at the top-hat which moves the entire assembly together. If you max out the camber with the factory crash bolt, or Whiteline bolt, you may only need to grind off a mm or two.

If you run the stock strut bolts, and are only adjusting camber at the top hat, it's going to need a few mm of grinding up and across the entire front of the arm to get enough clearance from lock-to-lock.