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> Understanding Head Hardware, Why are the aftermarket head hardware "junk"?
Highland
post Jun 5 2023, 04:52 PM
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So over the years I've read both here and on theSamba that the valves, guides, seats that come with AA and AMC heads are "junk". Why is that? Aren't they all made from hardened steel? Is there a difference between stainless steel valves? Is it a tolerance or material issue?

Is there a specific manufacturer of hardware that head builder use when building heads?
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