[nikwho]

Oh yeah! I always tune with both a vacuum gauge and a FAST dual sensor AFR gauge. I'm not worried about that piece. My static CR is 10.7:1. I have my dynamic CR written down on my cam card, but don't have it handy, nor do I recall exactly what it was. I've done all of the math. I know that I want to run 91 octane do to my compression. My concern was just the existing fuel in my tank, from before the swap, and what effect octane booster will have on that 18 or so gallons. I'm not worried about life beyond that point.