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Toyota
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1997
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Supra Liftback L6-2997cc 3.0L DOHC MFI
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Engine
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Cylinder Head Assembly
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Testing and Inspection
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Head Bolts
Head Bolts
Using a vernier caliper, measure the thread outside diameter of the bolt.
Standard outside diameter:
10.8-11.0 mm (0.425-0.433 inch).
Minimum outside diameter:
10.7 mm (0.421 inch).
If the diameter is less than minimum, replace the bolt