System Specifications
Cylinder Head and Valve TrainCombustion chamber volume 47.1 - 50.1 cm (2.874 in.)
Valve guide bore diameter 7.042 - 7.017 mm (0.2772 - 0.2763 in.)
Valve stem diameter-standard
Intake 6.971 - 6.991 mm (0.2744 - 0.2752 in.)
Exhaust 6.959 - 6.979 mm (0.2740 - 0.2748 in.)
Valve stem diameter-oversize
Intake 7.351 - 7.371 mm (0.289 - 0.290 in.)
Exhaust 7.339 - 7.359 mm (0.289 - 0.290 in.)
Intake 7.731 - 7.751 mm (0.304 - 0.305 in.)
Exhaust 7.719 - 7.739 mm (0.304 - 0.305 in.)
Valve stem-to-guide clearance
Intake 0.026 - 0.071 mm (0.001 - 0.0028 in.)
Exhaust 0.038 - 0.083 mm (0.0015 - 0.0033 in.)
Valve head diameter
Intake 40.0 mm (1.57 in.)
Exhaust 33.0 mm (1.30 in.)
Valve face runout 0.05 mm (0.002 in.)
Valve face angle 45 degrees
Valve seat width
Intake 1.5 - 2.0 mm (0.06 - 0.08 in.)
Exhaust 2.0 - 2.5 mm (0.08 - 0.10 in.)
Valve seat runout (TIR) 0.078 - 0.098 mm (0.003 - 0.004 in.)
Valve seat angle 45 degrees
Valve spring free length (approximately) 46.4 mm (1.85 in.)
Valve spring compression pressure
Valve open to maximum lift) 857.0 - 967.0 N (193 - 217 lbs.) @ 29.74 mm (1.17 in.)
Valve closed 285 - 323 N (64 - 72 lbs.) @ 40.52 mm (1.60 in.)
Valve spring installed height
Standard 41.98 - 44.17 mm (1.650 - 1.736 in.)
Service limit 10% force loss @ specified height
Rocker arm ratio 1:61
Cylinder Head bolts
Stage 1 50 Nm (37 ft. lbs.)
Stage 2 Loosen the bolts one full turn
Stage 3 30 Nm (22 ft. lbs.)
Stage 4 Rotate 90 degrees
Stage 5 Rotate an additional 90 degrees
Upper Intake Manifold:
Upper Intake Manifold bolts
Stage 1 hand tight.
Stage 2 10 Nm (89 in. lbs.)
Lower Intake Manifold bolts
Stage 1 15 Nm (11 ft. lbs.)
Stage 2 32 Nm (24 ft. lbs.)
Camshaft Thrust Plate 10 Nm (89 in. lbs.)