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 MANUALSPONTIAC1987FIREBIRD V8-350 5.7LREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER HEAD ASSEMBLYVALVE SPRING
1987 Pontiac Firebird V8-350 5.7L
Valve Spring
1987 Pontiac Firebird V8-350 5.7LSECTION Valve Spring
| Valve Spring Free Length | 2.03 Inch (in) Note: Damper spring, 1.86 inches. |
| Valve Spring Installed Height | 1.71 Inch (in) Note: Exhaust, 1.59 inches. |
| Seat Pressure | 76-84 at 1.70 Pound Force At Inch (lbf @ in) Note: Exhaust, 76-84 lbs. @ 1.61 inches. |
| Compressed Pressure | 194-206 at 1.25 Pound Force At Inch (lbf @ in) Note: Exhaust,196-204 lbs. @ 1.16 inches. |
| Out Of Square Limit | 0.062 Inch (in) |
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.