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YD8090a Cosworth Big Valve Cylinder Head Mazda Miata MZR 2.0/2.3L Our Price: $3889.99 Cosworth Big Valve Cylinder Head Mazda Miata MZR 2.0/2.3L Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm) valve springs...