[john walker's workshop]

personally, i don't think it's a good idea to put too many miles on it with a broken stud, although there are others on the board who think that the cam tower holds the row of heads tight enough so there's not a problem if only one stud is broken. if you're hearing the exhaust escaping between the head and cylinder, under acceleration, the explosion in the cylinder is obviously lifting the head off the cylinder it's supposed to be clamped against, right? i can see not worrying too much if there's no noise and the stud is on one of the center cylinders (2 and 5), which do have the support of the cam tower, but the outer ones don't have as much support. an aluminum head continuously beating on an aluminum cylinder will cause some damage to the sealing surfaces eventually, requiring ALL the heads be flycut to restore the surface, not to mention what to do about the top surface of the affected cylinder(s).