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I'm working on a set of heads and want to replace the existing Teflon valve seals,two have failed,with a fresh set of Viton.No markings or numbers on the Teflons.Guides measure .525 and looks like .530 seals,Teflon and Viton,are the most common available.Any opinions or experience as to whether the the .530's will suck up the slack?Thanks.
 
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