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Originally Posted by mechman600
These guys are speaking the truth. Back when I used to be into hot rods and I built a couple 60s V8s, it was common knowledge that valve seats must be replaced because of the [now] absence of lead.
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I think Mark Twain said it best:
Quote:
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It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.
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Looking at the first few of those Google hits, I notice a lot of discussion about whether there really is a problem on older cars. (And comments about how it's "normal" to do a valve job every 60-100K miles!) I see a bunch of people trying to make money selling hardened valve seats, mostly for crap engines like Harley-Davidson, where the valve seats were cast as part of the head... So I'll stick with my stated opinion: if in fact there ever was such a problem, it was due to the automakers' choice of substandard design & material.