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20000691 Cosworth Big Valve Cylinder Head Ford Focus 2.0L 2.3L Duratec 03-07 List Price: $3399.00 Our Price: $3230.00 You Save: $169.00 Cosworth Big Valve Cylinder Head Ford Focus 2.0L & 2.3L Duratec 03-07 The Cosworth Duratec CNC ported Big Valve cylinder head is the result of countless hours of development and testing. Starting with fresh large port castings, we precision machine both intake and exhaust ports to maximize flow. We then reshape the combustion chamber to un-shroud the the larger stainless steel valves. The head is then assembled using our hi-rev tapered springs along with new valve stem seals and retainers. This...