Yes, I have ran 89 and possibly 91 in the past as a trial. It did seem to help which is why I think I've just got it set up a little too aggressive for 87, especially if I run into the occasional tank of "bad gas". Especially at the gas prices now, I'll do what I have to to run on 87 as I'm not looking for every last hp. I use my car more as a nice day daily driver than a "hot rod" which is probably good since it really isn't much of a hot rod. Probably should have just left the factory cam alone the way I normally drive it.
