Express 3500 V8-6.0L VIN U (2004)
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For used heads tighten the spark plugs to 15 Nm (11 lb ft).
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For new aluminum heads tighten the spark plugs to 20 Nm (15 lb ft).
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For new iron heads, tighten the spark plugs to 30 Nm (22 lb ft).
4. Install the spark plug wires.