Deck Warpage
Check deck for damage or warped gasket surface. Place a straightedge across gasket surface of the deck. Using feeler gauge, measure clearance at center of straightedge. Measure across width and length of cylinder block at several points.
If warpage exceeds specifications, deck must be resurfaced. If warpage exceeds manufacturer's maximum tolerance for material removal, replace block.
NOTE:
Some manufacturers recommend that a total amount of material (cylinder head and cylinder block) can only be removed before components must be replaced.