A new-to-me, unrollerized GRiSO is currently in my garage. I'm trying to figure out which roller kit I need, but I'm a bit confused. On the AF1 website the flow chart goes:
O-ring groove on the inside of the valve cover?
Yes -> Kit A
No -> Continue to the next question
Is there a punch mark on the inward facing exterior of the head?
No -> Kit C " This Kit can only be used on bikes that DO NOT have a punch mark on the cylinder head"
Yes -> Kit B
Then Kit B says "For '09-'10 Moto Guzzi Stelvio with Early Type Valve Cover* and Punch Marked Head**"
At the same time, a printout on the Guzzitech forums suggests that the GRiSO either takes kit A or kit C.