Does anyone know of the differences, if any, between a 2009 JCW Clubman cylinder head and the 2009 Clubman S head?

 

According to Realoem.com they are exactly the same

 

Thanks for the info and the link.

 

Could be that they (MINI./BMW) decided to only stock JCW heads and use them on JCW's and S's in order to avoid stocking 2 sets of spare parts. The replacement parts don't necessarily tell you anything about the original parts. I learned this from the guy who was the technical editor for MC2 Magazine several years back...