NOTE: Resurfacing should be performed by a reputable machine shop.
Check the cylinder head for warpage by placing a straightedge across the gasket surface. Using feeler gauges, determine the clearance at the center of the straight edge. Measure across the diagonals, along the longitudinal centerline and across the cylinder head at several points. Should the warpage exceed 0.002 in. the cylinder head must be resurfaced, be sure to observe the following grinding limits: ff–1, 0.0197 in.; all other models, 0.020 in.