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Originally Posted by superjoe83
...it wouldn't be valve clearance because the clearance gets bigger when the engine warms up, thus if it was valve clearance it would get worse as the engine warms up
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I don't think that's true. Valve clearances tighten up when the engine gets hot. That's why the exhaust valves always have looser clearances when the engine is cold than intake valves - They heat up more than the intakes and tighten up the clearances more.