Combustion Chambers

Does anyone know how many cc's the combustion chambers are?

Out of the box, 56cc (varies from 55.5 to 56.5)

An off topic question, but did not think it was topic-worthy. I assume that the head is designed for maximum efficiency (and thus willnot need porting) but could one benefit from polishing the ports and combustion chambers of the head? Or...does it come pre-polished?

Edit: Nevermind. I see from the different options on the products page that there are still options for porting and headwork.