Thats a very similar spec to the Piper Ultimates which are 272deg and 9.07mm (inlet) and 9.02mm (exhaust).
I'd rather not mess around changing valve springs as my practical skill is limited - I can just about manage changing the cam.
So thanks for the info, Ill go with 774 (the new 773) or the piper ultimates.
Do you know the spec of the 774's? Matt lists them on eBay as 'an improvement over the 773' but there's no actual specs...
