gmc Workshop Repair Guides

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Drive Belts, Mounts, Brackets and Accessories > < Valve Spring|Specifications|Page 3473
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Valve: Specifications

Valve Lash .....................................................................................................................................................................................  Net Lash-No Adjustment 
Valve Lift (Exhaust) ..........................................................................................................................................................................  12.16 mm (0.479 inch)
Valve Lift (Intake) .............................................................................................................................................................................  11.79 mm (0.464 inch)
Valve Margin .........................................................................................................................................................................................  1.25 mm (0.05 inch)
Valve Face Angle ..................................................................................................................................................................................................  45 degrees
Valve Stem Clearance (Production-Exhaust) ..............................................................................................................  0.025-0.066 mm (0.001-0.0026 inch)
Valve Stem Clearance (Production-Intake) .................................................................................................................  0.025-0.066 mm (0.001-0.0026 inch)
Valve Stem Clearance (Service-Exhaust) .....................................................................................................  0.093 mm Maximum (0.0037 inch Maximum) 
Valve Stem Clearance (Service-Intake) .......................................................................................................  0.093 mm Maximum (0.0037 inch Maximum) 
Valve Stem Diameter (Production) .............................................................................................................................  7.955-7.976 mm (0.3132-0.314 inch)
Valve Stem Diameter (Service) ..............................................................................................................................  7.95 mm Minimum (0.313 in Minimum)

Drive Belts, Mounts, Brackets and Accessories > < Valve Spring|Specifications|Page 3473