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I wondered if this step would have some anti-reversion benefit but isn't it too close to the valve head for that? Also, some of my heads have the step on the short side radius, and some on the long side. I can't imagine anything good coming from that?
Steve, thanks for the clarification. I feel like I would need to hunt for heads that have the ceramic 100% intact. Any amount of flaking could theoretically end up under the valve. Seems that would be the siren song for almost all 3.6's if they were that sensitive? Can't argue that it looks like a pretty badly implemented engineering idea.
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