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There are a few options for valve stem sealing.....


The original umbrella types are easiest to install......they are available in standard rubber (which will crack and fall apart sooner) or viton (a very durable high temp material).....Ive read many opinions these do a lousy job of keeping excess oil off the stems.


Then there are "PC seals". These are composite seals with metal bands that hold onto the end of the valve guide. On Clevelands (as with many other engines), the tops of the guides must be machined as they are cone shaped. PC seals come in teflon and viton. Many engine builders feel the teflon PC seals control oil too much (although many stock engines including the 70's Ford V6 had them). Teflon has almost as high a temperature rating as viton (but not quite). Many late model engines have the viton PC seals, which appear to be temperature resistant and control oil a reasonable amount.



Ive seen viton seals for 11/32" valve stems on egay before.
 

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The vast majority of Clevelands came with 11/32" valve stems.
 
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