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Depending on the vehicle there are many wear points involved. There is wear at the valve seats, valve guides, valve stem, rocker arm to valve, rocker arm to pushrod, pushrod to lifter, lifter to camshaft and cam shaft. Some of these are eliminated if you have a overhead camshaft type engine. As the mileage piles up you may wear a few thousands on an inch at each wear point resulting in hearing ticking noises and loss of performance. With regular oil changes and proper adjustments you shouldn't have to keep adjusting them. Follow the manufacturer's recomendations.
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Can the valves be adjusted if so how?
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