General Specifications

Cylinder head and valve train
Cylinder head gasket surface flatness 0.05 mm (0.002 inch) per 51 mm (2 inch) 0.10 mm (0.004 inch) per total surface area
Cylinder head thickness - minimum 95 mm (3.74 inch)
Combustion chamber volume
Valve arrangement (front to rear)
Valve guide bore diameter 7.003-7.029 mm (0.276-0.277 inch)
Valve stem diameter 6.947-6.965 mm (0.2735-0.272 inch)
Valve stem-to-guide clearance maximum 0.140 mm (0.0055 inch)
Valve head diameter
Valve face runout (TIR maximum)0.038 mm (0.015 inch)
Valve face angle Exhaust - 37.5 degrees
Valve face angle Intake - 30 degrees
Valve seat width Exhaust - 1.80-2.56 mm (0.071-0.101 inch)
Valve seat width Intake - 1.48-2.24 mm (0.058-0.088 inch)
Valve seat runout 0.0035 mm (0.0014 inch)
Valve seat angle Exhaust - 37.5 degrees
Valve seat angle Intake - 30 degrees
Valve spring free length 51.96 mm (2.045 inch)
Valve spring solid height 36.1 mm (1.42 inch)
Valve spring compression 46.30 mm @ 340 ± 17 N pressure (1.82 in @ 76.5 ± 3.8 lbs.)
Valve spring compression pressure 383 mm (15.07 inch) @ 858 ± 43 N (1.51 in @ 191 ± 9.7 lbs.)
Valve spring installed height
Valve spring installed pressure
Camshaft bearing bore inside diameter 65.98-66.02 mm (2.597-2.599 inch)
Head gasket surface 0.10 mm (0.004 inch) across flatness the total area 0.05 mm (0.002 inch) across any 150 mm (5.9 inch) x 150 mm (5.9 inch) area 0.025 mm (0.001 inch) across any 25 mm (0.98 inch) x 25 mm (0.98 inch) area

Camshaft
Gear backlash 0.179-0.315 mm (0.007-0.012 inch)
Lobe lift Intake - 5.744 mm (0.2261 inch)
Lobe lift Exhaust - 5.832 mm (0.2296 inch)
Allowable lobe lift loss 0.51 mm (0.02 inch)
Journal diameter 61.987-62.013 mm (2.440-2.441 inch)
Camshaft journal bearing inside diameter 62.05-62.14 mm (2.443-2.446 inch)
Camshaft journal-to-bearing clearance 0.037-0.153 mm (0.0015-0.0060 inch)
Runout
End play 0.051-0.211 mm (0.002-0.008 inch)
Exhaust manifold warpage - maximum allowable clearance (cold) 0.0762 mm (0.003 inch)
Intake manifold warpage - between ports 0.13 mm (0.005 inch)
Intake manifold warpage - total 0.25 mm (0.0010 inch)