Ok, i measured the lift properly and it's 7.6mm on both cams, still no idea about the duration though. Any ideas as to how i'd find out if they are kelford's? the phonebook might help. Forgive me if i'm an idiot, but what exactly is an interface head? My understanding was that if the valves were allowed to open for too long (I.e. the belt snaps/timing way out) the pistons would smash up into them and bend everything out of whack, do interface heads have large enough combustion chambers so that the valves can be open when the piston is all the way up? Any ideas?
Thanks Loads