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I pulled bent valves like that out of a NorthStar with 12k miles. I also had a 3.6 with a shattered valve, blew a hole straight through the piston. I wanted to tear it apart to get a better look but GM wanted it back untouched.
Only valves I've seen loaded with carbon have been on the DI engines. IMO the gasoline flow on a normal engine helps keep the valves clean. I also think it has something to do with the VVT exhaust scavenging in place of a conventional egr system
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