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What secrets?Pick the valve size and angles that best suit your application or class rules.Keep the seat concentric and narrow.Check for good seal.Everything else is mathmetical measurements and pressures and geometry.Determine flow for cam,compression and engine size as well as induction.

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see what i mean?

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What about the weird wild wide world of "A" symmetrical valve work?

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What,s Azzsymmetrical,I still use an old Sunnen orbital