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 MANUALSCHEVROLET1986SPORTVAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (6.5L V8 DIESEL & TURBO DIESEL - VINS [F,P,S,Y])ENGINE SPECIFICATIONSCYLINDER HEAD SPECIFICATIONS
1986 Chevrolet Sportvan G20, 6.2 C, Standard
Cylinder Head Specifications
1986 Chevrolet Sportvan G20, 6.2 C, StandardSECTION Cylinder Head Specifications
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 1994 GMC Yukon, 1994 GMC Vandura Special, 1994 GMC Vandura, 1994 GMC Suburban, and 1994 GMC Rally Camper Special. However, it is still accessible from the selected car via links, so may be relevant.
CYLINDER HEAD SPECIFICATIONS
| Application | In. (mm) | ||||
|---|---|---|---|---|---|
| Maximum Warpage (1) | |||||
| Across Head Length | .006" (.15 mm) | ||||
| Across Head Width | .003" (.08 mm) | ||||
| Valve Seats | |||||
| Intake Valve | |||||
| Seat Angle | 46° | ||||
| Seat Width | .035-.060" (.89-1.53 mm) | ||||
| Maximum Seat Runout | .002" (.05 mm) | ||||
| Exhaust Valve | |||||
| Seat Angle | 46° | ||||
| Seat Width | .062-.093" (1.57-2.36 mm) | ||||
| Maximum Seat Runout | .002" (.05 mm) | ||||
| Valve Guide Oil Clearance | .0010-.0027" (.026-.069 mm) | ||||
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RENDER: 1.0x
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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.