Originally Posted by Kenbike
I wonder that mt self, I posted over on the Super Duke site. Not much on this site for guys hot rodding the motor on the Adventure.
i only found one topic from some body who did some port work.
The SD heads should be the same as from a 990ADV just check the part numbers.
The SDR head have some higher compression if i'm not mistaking but check the part numbers then you know for sure.