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 MANUALSCHEVROLET1993ASTRO VAN M V6-262 4.3L VIN ZREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYVALVE, INTAKE/EXHAUSTVALVE SPECIFICATIONS
1993 Chevrolet Astro Van M V6-262 4.3L VIN Z
Valve Specifications
1993 Chevrolet Astro Van M V6-262 4.3L VIN ZSECTION Valve Specifications
| Stem Diameter Standard | Intake | 0.3410-0.3417 |
| Exhaust | 0.3410-0.3417 | |
| Maximum Tip Refinish | - Note: Grind only enough to provide true surface. After grinding valve stems, ensure sufficient clearance remains between rocker arm and valve spring cap or rotator | |
| Face Angle | 45 | |
| Margin Note: Minimum | Intake | 0.0315 |
| Exhaust | 0.0315 |
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.