Jen 56 conversion
 

found this lurking on the shelf from 2005, sort of got over shadowed by my my Irvine 53s, the JEN 56 from Just engines UK, same as the SKs I think, it is ABC it is now replaced by the JEN 57 which is ringed is the current production, will give it a shot in the next few days and see how it compares to the Irvine 53 conversion martin
It did pop right off on a few drops down the carb and a couple of flips, great compression