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A couple other problems I see with camshaft engines are timing belts which have to fail some time. Most all engines are of an interference design and the belts often don't get replaced in time. The other is springs which not only require a fair amount of power to compress but they generate quite a bit of heat which is part of why oil is sprayed on them. That is why if you rev the engine until the valves float the extra heat generated by high speed oscillation of the springs weaken them allowing them to float at a lower rpm each time. To think I used valve float as a rev limiter when I was younger.
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