Cylinder Head Assembly

Cylinder Head-Bolts Refer to Cylinder Head/Service and Repair. Service and Repair
Cylinder Head Cover-Bolts 12 Nm (105 inch lbs.)
Flex Plate to Crankshaft 88 Nm (65 ft. lbs.)
Exhaust Manifold-Bolts 23 Nm (200 inch lbs.)
Exhaust Crossover Pipe-Bolts 54 Nm (40 ft. lbs.)
Intake Manifold
Lower-Bolts 23 Nm (200 inch lbs.)
Lower Gasket Retainer-Bolts 12 Nm (105 inch lbs.)
Upper-Bolts 12 Nm (105 inch lbs.)
Camshaft Sprocket-Bolt 54 Nm (40 ft. lbs.)
Camshaft Thrust Plate-Bolts 12 Nm (105 inch lbs.)
CAMSHAFT
Journal Diameter
#1 50.724 - 50.775 mm (1.997 - 1.999 inch)
#2 50.317 - 50.368 mm (1.9809 - 1.9829 inch)
#3 49.936 - 49.987 mm (1.9659 - 1.9679 inch)
#4 49.530 - 49.581 mmm (1.9499 - 1.9520 inch)
Bearing Clearance-Diametrical 0.025 - 0.101 mm (0.001 - 0.004 inch)
Bearing Clearance (Maximum Allowable) 0.127 mm (0.005 inch)
End Play 0.254 - 0.508 mm (0.010 - 0.020 inch)
Camshaft Bearing Diameter
#1 50.800 - 50.825 mm (1.9999 - 2.0009 inch)
#2 50.393 - 50.419 mm (1.9839 - 1.9849 inch)
#3 50.013 - 50.038 mm (1.9690 - 1.9699 inch)
#4 49.606 - 49.632 mm (1.9529 - 1.954 inch)
Exhaust Valve Timing
Closes-3.8L (ATDC) 18°
Opens-3.8L (BBDC) 46°
Duration-3.8L 244°
Intake Valve Timing
Closes-3.8L (ABDC) 63°
Opens-3.8L (ATDC) 1°
Duration-3.8L 242°
Valve Overlap-3.8L 17°
CYLINDER HEAD
Gasket Thickness (Compressed) 0.65 - 0.75 mm (0.0007 - 0.0024 inch)
VALVES
Face Angle Intake 45 - 45.5°
Face Angle-Exhaust 45 - 45.5°
Head Diameter-Intake 47.87 - 48.13 mm (1.88 - 1.89 inch)
Head Diameter-Exhaust 35.37 - 35.63 mm (1.39 - 1.40 inch)
Valve Lift (Zero Lash)-Intake and Exhaust 3.8L 11.0 mm (0.433 inch)
Valve Length-Intake 125.84 - 126.6 mm (4.95 - 4.98 inch)
Valve Length-Exhaust 127.20 - 127.96 mm (5.00 - 5.04 inch)
Valve Stem to Tip Height (valve tip to spring seat washer)-Intake 48.1 - 49.7 mm (1.89 - 1.95 inch)
Valve Stem to Tip Height (valve tip to spring seat washer)-Exhaust 48.53 - 50.09 mm (1.91 - 1.97 inch)
VALVE SEAT
Angle 44.5 - 45°
Run Out (Service Limits) 0.0762 mm (0.003 inch)
Width-Intake and Exhaust 1.50 - 2.00 mm (0.057 - 0.078 inch)
VALVE GUIDE
Guide Bore Diameter (Std.) 6.975 - 7.00 mm (0.274 - 0.275 inch)
VALVE MARGIN
Intake 0.825 - 0.973 mm (0.032 - 0.038 inch)
Exhaust 1.565 - 1.713 mm (0.061 - 0.067 inch)
VALVE STEM DIAMETER
Intake (Standard) 6.935 - 6.953 mm (0.2718 - 0.2725 inch)
Exhaust (Standard) 6.906 - 6.924 mm (0.2718 - 0.2725 inch)
VALVE STEM TO GUIDE CLEARANCE
Intake 0.025 - 0.065 mm (0.001 - 0.0025 inch)
Exhaust 0.059 - 0.094 mm (0.002 - 0.0037 inch)
Max Allowable-Intake (Rocking Method) 0.247 mm (0.010 inch)
Max Allowable-Exhaust (Rocking Method) 0.414 mm (0.016 inch)