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 MANUALSPONTIAC1987GRAND PRIX BASE, 4.3 Z, 200C/MV9REPAIR AND DIAGNOSISENGINE MECHANICALMECHANICAL4.3L V6 - VIN [Z]ENGINE SPECIFICATIONSVALVE SPECIFICATIONS
1987 Pontiac Grand Prix Base, 4.3 Z, 200C/MV9
Valve Specifications
1987 Pontiac Grand Prix Base, 4.3 Z, 200C/MV9SECTION Valve Specifications
VALVE
| Application | In. (mm) | |
|---|---|---|
| Intake | ||
| Head Diameter | 1.94 (49.28) | |
| Face Angle | 45° | |
| Seat Angle | 46° | |
| Seat Width | .031-.063 (.79-1.60) | |
| Stem Diameter | .3410-.3417 (8.661-8.679) | |
| Stem Clearance | .0010-.0027 (.025-.069) | |
| Valve Lift | .357 (9.07) | |
| Exhaust | ||
| Head Diameter | 1.50 (38.1) | |
| Face Angle | 45° | |
| Seat Angle | 46° | |
| Seat Width | .063-.094 (1.60-2.39) | |
| Stem Diameter | .3410-.3417 (8.661-8.679) | |
| Stem Clearance | .0010-.0027 (.025-.069) | |
| Valve Lift | .390 (9.91) | |
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.