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 MANUALSPONTIAC19906000 LE, 4D SEDAN, 2.5 RREPAIR AND DIAGNOSISENGINE MECHANICALMECHANICAL2.5L 4-CYL - VINS [R,U]ENGINE SPECIFICATIONSCYLINDER HEAD SPECIFICATIONS
1990 Pontiac 6000 LE, 4D Sedan, 2.5 R
Cylinder Head Specifications
1990 Pontiac 6000 LE, 4D Sedan, 2.5 RSECTION Cylinder Head Specifications
CYLINDER HEAD SPECIFICATIONS
| Application | Specification | ||
|---|---|---|---|
| Maximum Warpage | |||
| VIN R | .010" (.25 mm) | ||
| VIN U | .012" (.30 mm) | ||
| Valve Seats | |||
| Intake Valve | |||
| Seat Angle | 46° | ||
| Seat Width | .035-.075" (.89-1.91 mm) | ||
| Maximum Seat Runout | .002" (.05 mm) | ||
| Exhaust Valve | |||
| Seat Angle | 46° | ||
| Seat Width | .058-.105" (1.47-2.67 mm) | ||
| Maximum Seat Runout | .002" (.05 mm) | ||
| Intake Valve Guide Oil Clearance | .0010-.0026" (.028-.071 mm) | ||
| Exhaust Valve Guide Oil Clearance | .0013-.0041" (.033-.104 mm) | ||
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.