Uh, 66 283, I dont know if that was supposed to be a bash or what, but if you read my whole post, I used quite a few different numbers for some common DCR levels........ Kinda hinting at the fact that the numbers DONT say it all(actually I said it, not hinted at it), otherwise I woulda said "this is the only way to go". It kinda sounded like you were tying to say Im wrong by using an arguement that agrees with mine? As far as me saying supposedly 93 octane, I say that cause I wasnt there, nor did I send out an order for a gallon of that fuel so I can test it in hopes to bring up a case on the pump gas drags. So Im in no place to say, yes it was definitely 93 octane. My point was that many things, including DCR dictate how a motor responds to a given octane. If it was a totally useless number, I doubt any of us would concern ourselves with static compression numbers either, cause they are both forms of compression. One is theoretical, and the other is real world and does vary, but it works off of the theoretical number along with everything else. As far as your motor, if you give me your rod length, stroke lenght, and intake valve closing angle, I could figure out what the calculators say your DCR is with 11:1 compression, and Im guessing itll be a lower number. That number might not matter to you cause it sounds your plenty happy with the way things worked out reguardless, but I bet whatever number it is, it partially contributes to the fact that you can run so much nitrous through your motor on 93 fuel. If it dont matter, run a much smaller cam with no other changes, or just boost the static compression a couple points and see if it still works out as well as it does now. If I misinterpreted your post, than I apologize, but if not, than I am a little confused cause I though I made it pretty obvious that the numbers arent an exact science and can vary in every situation(like you said) depending on many things of which I listed just a few.