RPO L9H
Cylinder HeadCylinder 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.)
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 12.72 mm (0.501 in.)
Valve Lift - Intake 12.72 mm (0.501 in.)
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 - Valve 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.)
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 (76 lb at 1.8 in.)
Valve Springs - Valve Spring Load - Open 980 N at 33.55 mm (220 lb at 1.32 in.)
Cylinder Head Bolts
Install the NEW cylinder head bolts
Tighten the M11 cylinder head bolts (1-10) a first pass in sequence to 30 Nm (22 lb ft).
Tighten the M11 cylinder head bolts (1-10) a second pass in sequence to 90 degrees using J 45059.
Tighten the M11 cylinder head bolts (1-10) a final pass to 70 degrees using J 45059.
Tighten the M8 cylinder head bolts (11-15) to 30 Nm (22 lb ft). Begin with the center bolt (11) and alternating side-to-side, work outward tightening all of the bolts.
Intake Manifold Bolts
Tighten the bolts a first pass in the sequence shown to 5 Nm (44 lb in).
Tighten the bolts a final pass in the sequence shown to 10 Nm (89 lb in)
Exhaust Manifold Bolts
Tighten the bolts a first pass to 15 Nm (11 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.
Tighten the bolts a final pass to 20 Nm (15 lb ft). Tighten the exhaust manifold bolts beginning with the center 2 bolts. Alternate from side-to-side, and work toward the outside bolts.