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valve size increase with stock seats?

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Old 05-10-2023, 10:49 AM
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Default valve size increase with stock seats?
starting my 99 w '03 build - Kraken low mount, standalone, etc on the way. Re valves - the only larger valves I've installed have been in my old T2 VW bus engine - went from 35mmI/33E to 42I/35E. Obv had to have new seats installed. Are the Miata heads going up +1-2mm in valve dia w stock seats or new seats?

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Old 05-10-2023, 02:35 PM
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The oe seats will accommodate 1-2mm over valves.
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