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Cars don't really blow valves per say. It can drop a valve or burn a valve. If it drops a valve, meaning the valve comes loose it will probably knock badly and the engine may not turn over at all if it locks up the engine. If it burns a valve, it will have reduced power and may skip or blow pressure back thru the intake depending if it's an intake or exhaust valve. Either way running the engine in this condition will cause more damage.

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Q: What are signs a car blew a valve?
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