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Phoenix,
The SCA had 1.45" intake and 1.25" exhaust valves as standard. It appears that the SCB and SCC had the same, but I have seen a listing for an SCD engine, which was a 1500cc SCB engine with larger valves. The sizes listed are 1.55" intake and 1.30" exhaust. A couple of my cylinder heads have modified ports and larger valves but I am thinking this was done by the customer and not by Cosworth.
Regards,
Rob
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