And Penny just keeps on changing...

[Vegas69]

I agree, we are both pushing our chassis's to the max. I felt like my 491/497 at the tires was really managable across the board. I have similar expectations. 650-675hp and 625 ftlbs. Your making a vast improvment in your low end torque with identical stroke to me. I was able to hook up that 497 at 3800 with R888's in second gear matted during autocross. I felt it was about the limit however. A little loose but biting hard. On 200 tread wear tires I'm not to sure. You're going to gain some pull out of those slow corners and I'm going to gain 500-700 rpm to avoid shifting into 3rd until 85 or so. We'll put all that power to use on the road course for sure. Crazy you can run 11.5:1 on a 114 with 91 octane. Do you run a knock sensor? I'd error on the side caution. Compression doesn't gain that much power.