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.
1991 Pontiac Firebird V8-350 5.7LFACTORY OEM SERVICE PROCEDURE
Engine Specifications
Engine Specifications
Type V8
Displacement 5.7L (350 CID)
Bore 101.60 mm (4.000")
Stroke 88.39 mm (3.480")
Compression Ratio 9.75:1
Firing Order 1-8-4-3-6-5-7-2
Camshaft Lobe Lift ± 0.050 mm (0.002")
Intake 6.99 mm (0.275")
Exhaust 7.24 mm (0.285")
Valve Lift
Intake 10.49 mm (0.413")
Exhaust 10.87 mm (0.428")
Spark Plugs
Type R45TS, or equivalent
Gap 0.89 mm (0.035")
Torque 15 Nm (11 lb. ft.)
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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