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Hey guys. I'm rebuilding my 396 and the heads had only umbrella seals on the valves. The valves don't have a second groove for o rings and the stems aren't machined for positive seals. Will just umbrellas on the valves be ok?

Thanks.
 

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They'll be good enough especially for a stock motor. They have done the job well enough for many motors and thousands upon thousands of miles.
For high performance I personally would go to a positive seal.
 
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