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new pistons required to run +1mm valves?

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Old Apr 7, 2009 | 04:36 PM
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ChefJ
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From: Braselton, GA
Default new pistons required to run +1mm valves?
Simple question I am working on a head, and before I purchase the valves I need to know if going with a 1mm oversized valve will require pistons. Thanks in advance.
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Old Apr 7, 2009 | 06:50 PM
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LostMotion
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Doesn't make any more power, been tried before.

And yes you might have some issues, the radial clearances are tight. Depends on if the head is milled or you are using a cam gear.
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