Cylinder Head, Valves & Valve Spring Specifications
CYLINDER HEAD
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Gasket Thickness (Compressed) | 1.35 mm | 0.053 in. |
CYLINDER HEAD VALVE SEAT
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Seat Angle | 44°-44.5° | |
| Runout (Max.) | 0.038 mm | 0.002 in. |
| Width (Finish) Intake and Exhaust | 1.02-1.52 mm | 0.040-0.060 in. |
| Guide Bore Diameter (Std.) | 7.95-7.98 mm | 0.313-0.314 in. |
VALVES
| DESCRIPTION | SPECIFICATION | |
| Metric | Standard | |
| Face Angle | 45-45.5° | |
| Back Cut Angle | 25°-29° | |
| Stem Diameter-Intake and Exhaust | 7.90-7.92 mm | 0.331-0.312 in. |
| Head Diameter-Intake | 50.67-50.93 mm | 1.995-2.005 in. |
| Head Diameter-Exhaust | 40.01-40.26 mm | 1.575-1.585 in. |
| Length-Intake (Over All) | 145.69-146.33 mm | 5.736-5.761 in. |
| Length-Exhaust (Over All) | 146.23-146.86 mm | 5.757-5.782 in. |
| Valve Margin-Intake | 1.30 mm | 0.051 in. |
| Valve Margin-Exhaust | 2.03 mm | 0.080 in. |
| Lift-Intake (Zero Lash | 14.06 mm | 0.554 in. |
| Lift-Exhaust (Zero Lash) | 14.06 mm | 0.554 in. |
| Valve Stem Tip Height | 52.96 mm | 2.085 in. |
| Stem-to-Guide Clearance-Intake and Exhaust | 0.025-0.076 mm | 0.001-0.003 in. |
| Max. Allowable-Intake (Rocking Method) | 0.50 mm | 0.020 in. |
| Max. Allowable-Exhaust (Rocking Method) | 0.70 mm | 0.027 in. |
VALVE SPRING
| DESCRIPTION | SPECIFICATION | |
|---|---|---|
| Metric | Standard | |
| Free Length - Spring | 55.0 mm | 2.165 in. |
| Free Length - Spring Damper | 47 mm | 1.850 in. |
| Spring Tension (Valve Closed) | 534 +/- 20 N @ 44.5 mm | 120 +/- 4.5 lbs. @ 1.750 in. |
| Spring Tension (Valve Open) | 1245 +/- 40 N @ 30.6 mm | 280 +/- 9.0 lbs. @ 1.207 in. |
| Number of Coils - Spring | 7.25 Right Hand Twist | |
| Number of Coils - Spring Damper | 3.6 to 4.0 Left Hand Twist | |
| Wire Diameter (Ovate) | 4.2 x 5.3 mm | 0.166 x 0.208 in. |
| Installed Height (Spring Seat to Bottom of Retainer) | 44.5 mm | 1.750 in. |