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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISSPECIFICATIONSMECHANICAL SPECIFICATIONSENGINECYLINDER BLOCK ASSEMBLYPISTON, ENGINE
1998 Pontiac Firebird V8-5.7L VIN G
Piston, Engine
1998 Pontiac Firebird V8-5.7L VIN GSECTION Piston, Engine
Piston Outside Diameter (At Size Point) 98.964 - 98.982 mm (3.8962 - 3.8969 mm)
Piston Out Of Round 0.018 mm (0.0007 inch)
Piston To Bore Clearance (Production):
Maximum 0.018 - 0.054 mm (0.0007 - 0.00212 inch)
Piston Compression Ring Groove Clearance:
Production:
Top 0.04 - 0.085 mm (0.00157 - 0.003346 inch)
2nd 0.04 - 0.08 mm (0.00157 - 0.003149 inch)
Service Limit:
Top 0.04 - 0.085 mm (0.00157 - 0.003346 inch) Maximum
2nd 0.04 - 0.08 mm (0.00157 - 0.003149 inch) Maximum
Piston Oil Ring Groove Clearance:
Production 0.01 - 0.22 mm (0.0004 - 0.00866 inch)
Service Limit 0.01 - 0.22 mm (0.0004 - 0.00866 inch) Maximum
Piston Out Of Round 0.018 mm (0.0007 inch)
Piston To Bore Clearance (Production):
Maximum 0.018 - 0.054 mm (0.0007 - 0.00212 inch)
Piston Compression Ring Groove Clearance:
Production:
Top 0.04 - 0.085 mm (0.00157 - 0.003346 inch)
2nd 0.04 - 0.08 mm (0.00157 - 0.003149 inch)
Service Limit:
Top 0.04 - 0.085 mm (0.00157 - 0.003346 inch) Maximum
2nd 0.04 - 0.08 mm (0.00157 - 0.003149 inch) Maximum
Piston Oil Ring Groove Clearance:
Production 0.01 - 0.22 mm (0.0004 - 0.00866 inch)
Service Limit 0.01 - 0.22 mm (0.0004 - 0.00866 inch) Maximum
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.