ive just had to do a head and cam change on my rst orion as the cam snapped destroying the stage3 head and stainless vavles in the process

i brough just a cheap to get it back on the road (rents going mad at it in the garage )

anyway i noticed a marking on the head where the ** are to indicate its unleaded type. the markings look something like this *2 * 5 *.
does anyone know if this is the marking for over sized cam tappets etc
cheers