Quote:
Originally Posted by GordonP
I'm told unleaded gas is tough of the exhaust valves because it burns hotter. I have no data to support this, but the new valves are stainless, and stainless inserts don't burn like the stock block does in my experience.
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Rich Fallucca of Antique Engine Rebuilding in Skokie IL gave a lecture four years ago where he addressed this – basically said he'd never seen evidence to support the lead hypothesis, but he does put insert seats in his engines for other reasons. See clip here for lead:
https://youtu.be/N5kDrtTJGsU?t=3134
And here for valve seats:
https://youtu.be/N5kDrtTJGsU?t=3375