gains?
I realize the non-H.O. 800 motor benefits more from a head than this engine does, but are there still noticable gains (better cooling, better throttle response, added HP) by running a high compression head? Isn't the stock head considered "high compression" to some degree, hence the min 91 octane fuel requirement?
I loved the RKT head I had on my old M7. It made a huge difference. I'm just not sure if its worth the coin if it doesn't make a big improvement. Obviously, the higher the altitude you are running, the larger the gains could be with running a hi-comp head but unless a guy is always riding at 10,000 feet, I'm not sure its worth it. I also haven't ran a high compression head on this engine either, so maybe there's more to it.
Those of you that are running RKT's head, how big of a difference in performance can you contribute to the head alone?