LS V8-3.9L VIN A (2003)
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Intake valve clearance: 0.18 - 0.22 mm (0.00709 - 0.00866 inch)
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Exhaust valve clearance: 0.33 - 0.38 mm (0.0128 - 0.0148 inch)
NOTE: A midrange clearance is the most desirable:
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Intake: 0.20 mm (0.00787 inch)
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Exhaust: 0.35 mm (0.014 inch)
NOTE: Select shims using this formula: required shim thickness = measured clearance plus the base shim thickness minus most desirable
clearance.
Select shims and mark the installation location.
6. Install new shims.
7. Install the camshaft.
8. Measure the new valve clearances.
9. Install the timing chains.
