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With the engine at operating temperature remove the valve covers. With the engine idling back off on the rocker arm nut until the rocker starts tapping. Tighten the rocker arm slowly until the noise stops. Then tighten it 3/4 of a turn more. Do each one the same and reinstall the valve covers.

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15y ago
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Q: How do you adjust hydraulic tappets on a 283 Chevrolet?
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