Re: Burnt valves???
I have had dozens of those v 6 gmc engines. I have never seen any evidence of seat erosion from unleaded Gas. I have seen valves burnt from not enough lash quite a few times. I will add I rebuild engines regularly. I have a full machine shop with two head mills. Plus everything else. Hardened seats take an hour or so and some engines require them. But I have never done them on a v6. Even a turbo 305 running 12 pounds of boost with some really high EGT numbers has been fine. Check the lash and then compression test. Barry.
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