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To adjust the valves on an Oldsmobile 403 engine, first ensure the engine is cold and remove the valve covers. Use a feeler gauge to check the clearance between the rocker arm and the valve stem, adjusting as necessary by loosening the lock nut and turning the adjusting screw to achieve the specified clearance. Repeat this process for each valve, following the correct firing order, and recheck clearances after adjustment. Finally, replace the valve covers and ensure all fasteners are tightened to the manufacturer's specifications.
What else can I help you with?
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