| do the same thing as above: Close the gap between the washer and the nut face with a spacer; and then tighten the nut back up to where it is now. Just be very careful. Any pressure on that end of the manifold is better than nothing. Also, care should be taken not the break the seal between the head/gasket/manifold. Any heavy hammer hits and that seal will be compromised and an exhaust leak will be almost certain.
_________________________________________________

|