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Before the spring seats are enlarged, it's a good idea to use a valve-height micrometer. Once the seats have been enlarged, recheck the valve height to make sure the spring-seat depth has not been altered.
It's A Spring Thing

 Before the spring seats are enlarged, it's a good idea to use a valve-height micrometer. Once the seats have been enlarged, recheck the valve height to make sure the spring-seat depth has not been altered.  View Related Article

 

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