Virginiafiretruck,
I have seen folks mention grinding down the alignment rings to compensate for material removed when the intake/exhaust combo was surfaced. If lots of material has been removed, the rings have the possibility of keeping the
assembly from fully seating.
Unless the intake or exhaust were broken, replacing it would be for naught. If this intake exhaust was surfaced properly as a unit bolted together, and not disturbed when reinstalled, it MUST be flat. The manifold bolts must have sufficient threads to pull all this down tight.
Stuart
