Service Specifications

CYLINDER HEAD
Cylinder Head Gasket (Thickness Compressed) 1.78 mm (0.070 in.)
Valve Seat
Angle 45 - 45 1/2°
Run-Out (Maximum) 0.051 mm (0.002 in.)
Valve Seat Width (Finished)
Intake and Exhaust 1.25 - 1.75 mm
(0.0492 - 0.0689 in.)
Guide Bore Diameter (Std) 6.975 - 7.00 mm
(0.2746 - 0.2756 in.)
Valve Guide Height 9.5 - 10.5 mm
(0.3740 - 0.4134 in.)

VALVES
Face Angle 44 1/2 - 45 °
Head Diameter
Intake 34.87 - 35.13 mm
(1.3728 - 1.3831 in.)
Exhaust 28.87 - 29.13
(1.1366 - 1.1469 in.)
Length Overall
Intake 114.41 - 114.99 mm
(4.5043 - 4.5272 in.)
Exhaust 125.67 - 126.25 mm
(4.9476 - 4.9705 in.)
Stem Diameter
Intake 6.935 - 6.953 mm
(0.2730 - 0.2737 in.)
Exhaust 6.906 - 6.924 mm
(0.2719 - 0.2726 in.)
Maximum Allowable (By Rocking Method)
Intake 0.29 mm
(0.0114 in.)
Exhaust 0.370 mm
(0.0146 in.)
Lift (Zero Lash)
Intake 8.15 mm
(0.3209 in.)
Exhaust 6.53 mm
(0.2571 in.)
Valve Stem Tip Height(From Cylinder Head Surface)
Intake 42.366 - 43.655 mm
(1.6680 - 1.7187 in.)
Exhaust 44.705 - 45.986 mm
(1.760 - 1.8105 in.)

VALVE SPRINGS.
Number of Coils
Intake 6.88
Exhaust 7.21
Color of Springs (Top of Coils)
Intake White
Exhaust Pink
Wire Diameter
Intake 4.29 - 4.34 mm
(0.1689 - 0.1709 in.)
Exhaust 4.16 - 4.22 mm
(0.1638 - 0.1661 in.)
Installed Height (Spring Seat to Bottom of Retainer)
Intake 38.0 mm
(1.4961 in.)
Exhaust 38.0 mm
(1.4961 in.)
Free Length (Approx.)
Intake 45.24 mm
(1.7811 in.)
Exhaust 45.70 mm
(1.7992 in.)
Spring Tension (Valve Closed)
Intake 402 - 444 N @ 38.0 mm
(90.3 - 99.7 lbs. @ 1.4961 in.)
Exhaust 359 - 397 N @ 29.85 mm
(80.7 - 89.3 lbs. @1.4961 in.)
Spring Tension (Valve Open)
Intake 898 - 972 N @ 29.85 mm
(201.7 - 218.3 lbs. @ 1.1752 in.)
Exhaust 705 - 763 N @ 31.47 mm
(158.5 - 171.5 lbs. @ 1.239 in.)