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?

thanks

Wombat

 

The oe seats will accommodate 1-2mm over valves.