Jack said:
> My 228 GMC six did not have hardened seats, and I never
> ran it with any additives. I probably put 15 thousand
> miles on it, the majority at highway speed, using only
> unleaded - and on teardown after it blew a head gasket,
> I noticed no appreciable valve seat recession. Total
> mileage on the engine was about 60K at that point. Of
> course, I had hardened seats installed as part of the
> ensuing valve job. I have seen a couple of 235 heads,
> and several vintage Brit motorcycle engines, in similar
> condition.
I had similar results to Jack when I blew my head gasket. The pics of my
head & gasket are somewhere in the tech section of chevytrucks.org, I think.
I took the head into my favorite engine shop and they wanted somewhere
between $300 and $600 to rebuild the head with the hardened valves. So I
decided against it. The wear was nominal.
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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