Exhaust studs with headers?

How much side clearance with the exhaust tubes do you have with the original nuts on those studs? Sometimes the original diameter nuts/hardware won't fit or the edges of the nuts hit the tubes when spun on, which is why they make mini head header bolts, and allen head bolts. Before you tighten everything up, try re-using the end stud hardware to hold it in place. The studs are a blessing and a curse - they help hold the headers on when getting them first installed but use up precious wiggle room sometimes needed between the head and inner fenderwell for installing the header.