Cylinder Head Assembly

Cylinder Head
Cylinder Head Height/Thickness - Measured from the Cylinder
Head Deck to the Valve Rocker Arm Cover Seal Surface 120.2 mm (4.732 in.)
Surface Flatness - Block Deck - Measured Within a 152.4 mm (6.0 in)
Area 0.08 mm (0.003 in.)
Surface Flatness - Block Deck - Measuring the Overall Length of
the Cylinder Head 0.1 mm (0.004 in.)
Surface Flatness - Exhaust Manifold Deck 0.13 mm (0.005 in.)
Surface Flatness - Intake Manifold Deck 0.08 mm (0.0031 in.)
Valve Guide Installed Height - Measured from the Spring Seat Surface
to the Top of the Guide 17.32 mm (0.682 in.)
Intake Manifold
Surface Flatness - Measured at Gasket Sealing Surfaces and Measured
Within a 200 mm (7.87 in) Area that Includes 2 Runner
Port Openings 0.3 mm (0.118 in.)

Valve System
Valves - Valve Face Angle 45 degrees
Valves - Valve Face Width 1.25 mm (0.05 in.)
Valves - Valve Lash Net Lash - No Adjustment
Valve Lift - Exhaust - Active Fuel Management 12.46mm 0.491in
Valve Lift - Intake - Non Active Fuel Management 12.24mm 0.488in
Valve Lift - Intake - Active Fuel Management 12.46mm 0.491in
Valves - Valve Seat Angle 46 degrees
Valves - Valve Seat Runout 0.05 mm (0.002 in.)
Valves - Valve Seat Width - Exhaust 1.78 mm (0.07 in.)
Valves - Seat Width - Intake 1.02 mm (0.04 in.)
Valves - Valve Stem Diameter - Production 7.955-7.976 mm (0.313-0.314 in.)
Valves - Valve Stem Diameter - Service 7.95 mm (0.313 in.)
Valves - Valve Stem-to-Guide Clearance -
Production - Exhaust 0.025-0.066 mm (0.001-0.0026 in.)
Valves - Valve Stem-to-Guide Clearance -
Service - Exhaust 0.093 mm (0.0037 in.)
Valves - Valve Stem-to-Guide Clearance - Production - Intake 0.025-0.066 mm 0.001-0.0026 in
Valves - Valve Stem-to-Guide Clearance - Service - Intake 0.093 mm 0.0037 in
Valves - Valve Stem Height - Measured from Spring Seat - Intake and Exhaust 50.85 +/- 0.375 mm 2.00 +/- 0.015 in
Rocker Arms - Valve Rocker Arm Ratio 1.70:1
Valve Springs - Valve Spring Free Length 52.9 mm 2.08 in
Valve Springs - Valve Spring Installed Height 45.75 mm 1.8 in
Valve Springs - Valve Spring Load - Closed 340 N at 45.75 mm 76lb at 1.8in
Valve Springs - Valve Spring Load - Open 980 N at 33.55 mm 220 lb at 1.32 in





The cylinder head bolts are of a torque-to-yield design and are NOT to be reused.

Cylinder Head M11 Bolts - (1-10) First Pass in Sequence 30 Nm (22 lb ft.)
Cylinder Head M11 Bolts - (1-10) Second Pass in Sequence 90 degrees
Cylinder Head M11 Bolts - (1-10) Final Pass in Sequence 70 degrees
Cylinder Head M8 Bolts - (11-15) 30 Nm (22 lb ft.)
Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
Cylinder Head Plug 20 Nm (15 lb ft.)

Intake Manifold Bolts torque and sequence. Specifications
Exhaust Manifold torque and sequence. Specifications
Camshaft Gear/Sprocket Specifications