Flatness Measurement Procedure
WARNING: This page is about a different car, the 2002 GMC Yukon XL, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Measure the cylinder head for warpage with a straight edge and feeler gage.
- A cylinder head block deck with warpage in excess of 0.050 mm (0.002 in) within a 150.0 mm (6.0 in) area must be repaired or replaced.
- A cylinder head exhaust manifold deck with an overall warpage in excess of 0.102 mm (0.004 in) must be repaired or replaced.
- A cylinder head intake manifold deck with warpage in excess of 0.080 mm (0.003 in) must be repaired or replaced.
- A cylinder head block deck can be resurfaced up to 0.305 mm (0.012 in) maximum removal.
Important: Excessive cylinder head resurfacing will affect compression ratio and emission control.
- A cylinder head that requires excessive resurfacing must be replaced.