Cylinder Head Specifications

CYLINDER HEAD SPECIFICATIONS

Compression (Hot)
250 RPM (Open Throttle)
Standard 1310 kPa (190 psi min)
Service Limit 1,241 kPa (180 psi min)

Cylinder Leakage (Hot)
689 kPa (100 psi) Input
Standard 69 kPa 10% max (10 psi max)
Service Limit 138 kPa 15% max (20 psi max)

Cylinder Head
Total Height
Standard 134.0 mm (5.276 in.)
Service Limit 133.9 - 134.1 mm (5.272 - 5.280 in.)

Maximum Distortion (Length)
Service Limit 0.05/100 mm (0.0020/3.937 in.)

Valve
Face Angle
Service Limit 45 degrees

Seat Angle
Service Limit 45 degrees

Seat Width
Intake
Standard 1.0 - 1.4 mm (0.0394 - 0.0551 in.)

Exhaust
Standard 1.4 - 1.8 mm (0.0551 - 0.0709 in.)

Valve Length - Production
Intake
Standard 102.1 mm (4.016 in.)

Exhaust
Standard 92.25 mm (3.632 in.)

Valve Length - Service
Intake
Standard 101.7 mm (4.0039 in.)

Exhaust
Standard 91.8 mm (3.6141 in.)

Valve Stem Diameter
Standard (K) Intake
Standard 5.955 - 5.970 mm (0.2344 - 0.2350 in.)

Standard (K) Exhaust
Standard 5.945 - 5.960 mm (0.2341 - 0.2346 in.)

Oversize (K 1-0.075) Intake
Standard 6.030 mm (0.2374 in.)

Oversize (K 1-0.075) Exhaust
Standard 6.020 mm (0.2370 in.)

Valve Guide Diameter
Standard (K)
Standard 6.000 - 6.012 mm (0.2362 - 0.2367 in.)

Oversize (K 1-0.075)
Standard 6.075 - 6.090 mm (0.2392 - 0.2398 in.)

Valve Guide Installed Height
Standard 13.7 - 14.0 mm (0.5394 - 0.5512 in.)

Stem Clearance
Intake
Standard 0.030 - 0.057 mm (0.0012 - 0.0022 in.)

Exhaust
Standard 0.040 - 0.067 mm (0.0016 - 0.0026 in.)

Valve Height
Intake
Standard 39.2 mm (1.543 in.)

Exhaust
Standard 39.2 mm (1.543 in.)

Intake and Exhaust Compressed at 252 N (56.6 lbs)
Standard 34 mm (1.338 in.)

Camshaft
Exhaust Cam Lobe Lift Rise
Standard 8.66 - 8.74 mm (0.3409 - 0.344 in.)
Service Limit 8.61 mm (0.339 in. min.)

Lifter Body Diameter
Standard 32.959 - 32.975 mm (1.2976 - 1.282 in.)
Service Limit 32.947 mm (1.297 in. min.)

Lifter Body Clearance
Standard 0.025 - 0.066 mm (0.0010 - 0.0026 in.)
Service Limit 0.083 mm (0.003 in. max)

Journal Diameter
Standard 27.939 - 27.960 mm (1.099 - 1.101 in.)

Bearing Clearance
Standard 0.040 - 0.082 mm (0.0015 - 0.0020 in.)

End Play
Standard 0.04 - 0.144 mm (0.0016 - 0.0057 in.)

Spark Plug
Type
Standard Bosch FLR-LTE, GM P/N 90541059

Gap
Standard 0.9 - 1.1 mm (0.035 - 0.043)

Torque
Standard 25 Nm (19 lb. ft.)

Oil Pressure - Minimum
Engine Idle - at Normal Operating Temperature
Service Limit 110 kPa (16 psi)