I'm putting together a 1.6L mill for my Samurai and I was wondering about compression ratios. How high can I go with A NA Zuk motor before I run into problems with detonatin? How about using 92 octane over 87? I'm going to run my new 1.3L 8V head with the Hawk billet torquer cam on a 1.6L block with EFI and a Calmini header. What would be the optimal CR for this set-up?