Dodge Cummins Diesel Forum - View Single Post - 12v valve stem (old style) seals slipping off head
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post #7 of (permalink) Old 05-07-2019, 05:36 PM Thread Starter
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Originally Posted by thor363 View Post
I had my head machined for the new 'top-hat' style seals due to this issue. Sure, it doesn't happen to most folks, but I wanted the reliability.
Was the machining required for the new seals? What year 12 valve?
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