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Discussion Starter #1
My question is do they tighten up or loosen up over time logic tells me they loosen up and i have heard from other people they tighten up and they got me second guessing myself so figured id ask yall.

Next question is
i know intake is .10 - .20 and exhaust is .20 - .30 so wondering what i should shoot for clearance when i shim it.

thanks in advance
 

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They tighten up over time. Hence why you need to change the shims when the valves stretch.
 
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