valve seat failure and piston damage

design-jediMember

Looking for thoughts on a valve seat failure and a recommendation for an engine builder/ machine shop in Orange County, CA.

After sitting for 10+ years I finally fired up my engine a few weeks ago. It sounded good for 10 minutes then I had a bad clatter in the valve train. At first it appeared to be a loose rocker but there was weird interaction with the valves of cylinder #4. I popped the head off and found that the exhaust seat had come loose!

While dancing around, the seat also made some deep marks on the piston head.

My gut tells me the piston is trashed and needs to be replaced. I have a friend that says I should repair the head and go as is. I don’t know if anybody on this forum has an opinion…. But, when is a “witness mark” a catastrophic failure in the waiting?

Please opine away....

Thanks,

John

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3/26/248:26 PM

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