Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2004EXPRESS 1500 RWD V8-5.3L VIN TREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYSYSTEM SPECIFICATIONSENGINE MECHANICAL SPECIFICATIONSVALVE SYSTEM
2004 Chevrolet Express 1500 RWD V8-5.3L VIN T
Valve System
2004 Chevrolet Express 1500 RWD V8-5.3L VIN TSECTION Valve System
GENERAL SPECIFICATIONS
Valve System
Valves
Face Angle 45 degrees
Face Width 1.25 mm (0.05 inch)
Valve Lash Net Lash - No Adjustment
Valve Lift - Intake 11.6 mm (0.457 inch)
Valve Lift - Exhaust 11.85 mm (0.466 inch)
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm (0.002 inch)
Valve Seat Width - Exhaust 1.78 mm (0.07 inch)
Seat Width - Intake 1.02 mm (0.04 inch)
Valve Stem Diameter - Production 7.955 - 7.976 mm (0.313 - 0.314 inch)
Valve Stem Diameter - Service 7.95 mm (0.313 inch)
Valve Stem-to-Guide Clearance - Production - Intake 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem-to-Guide Clearance - Service - Intake 0.093 mm (0.0037 inch)
Valve Stem-to-Guide Clearance - Production - Exhaust 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem-to-Guide Clearance - Service - Exhaust 0.093 mm (0.0037 inch)
Rocker Arms
Valve Rocker Arm Ratio 1.70:1
Valve Springs
Free Length 52.9 mm (2.08 inch)
Valve Spring Installed Height 45.75 mm (1.8 inch)
Valve Spring Load - Closed 340 N at 45.75 mm (76 lbs. at 1.8 inch)
Valve Spring Load - Open 980 N at 33.55 mm (220 lbs. at 1.32 inch)
Valve System
Valves
Face Angle 45 degrees
Face Width 1.25 mm (0.05 inch)
Valve Lash Net Lash - No Adjustment
Valve Lift - Intake 11.6 mm (0.457 inch)
Valve Lift - Exhaust 11.85 mm (0.466 inch)
Valve Seat Angle 46 degrees
Valve Seat Runout 0.05 mm (0.002 inch)
Valve Seat Width - Exhaust 1.78 mm (0.07 inch)
Seat Width - Intake 1.02 mm (0.04 inch)
Valve Stem Diameter - Production 7.955 - 7.976 mm (0.313 - 0.314 inch)
Valve Stem Diameter - Service 7.95 mm (0.313 inch)
Valve Stem-to-Guide Clearance - Production - Intake 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem-to-Guide Clearance - Service - Intake 0.093 mm (0.0037 inch)
Valve Stem-to-Guide Clearance - Production - Exhaust 0.025 - 0.066 mm (0.001 - 0.0026 inch)
Valve Stem-to-Guide Clearance - Service - Exhaust 0.093 mm (0.0037 inch)
Rocker Arms
Valve Rocker Arm Ratio 1.70:1
Valve Springs
Free Length 52.9 mm (2.08 inch)
Valve Spring Installed Height 45.75 mm (1.8 inch)
Valve Spring Load - Closed 340 N at 45.75 mm (76 lbs. at 1.8 inch)
Valve Spring Load - Open 980 N at 33.55 mm (220 lbs. at 1.32 inch)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.