I`ve been running my 10.3/roller cammed/aum. headed/505" wedge at 21 initial,(just recently bumped it to 22) , 34 in at 3400, and 44 cruising. I was wondering about bringing it in faster w/ the 91/ non ethanol lawnmower gas we use now. Also about upping the 44 a little. No pinging that I`M AWARE OF, but the things loud enough I might not hear it (I`m not the best hearing old man on the planet).