Thanks folks.

I'll pull the valve cover off and pull a bolt and check for depth of hole and bolt length.

Any risk of cracking a head if I retorque the bolts? With engine warm I presume.

If that doesn't work, then I guess I'll have to pull the head and check for flatness and try again.

John.

When God gives any man wealth and possessions, and enables him to enjoy them, to accept his lot and be happy in his work�this is a gift of God. He seldom reflects on the days of his life, because God keeps him occupied with gladness of heart. Ecclesiastes 5:19-20