At 64 inches I love it. I've tried other combos but I didn't like the pull. Infact my et went down with 16/45 and 15/42. That didnt work for me either. I caculated the gear ratio and its what work best for me. Of course I'm stock displacement with spray but I haven't sprayed it yet. I only have about 9 passes on the bike and have no problem getting out the hole. As long as I r it up right and leave at the same grand I'm cool. My 60's kind of suck though, not where I want then to be,1.54, 1.55. I need a lock up clutch.I use to do a lot better on my old school but it had a 10 over arm on it to. I'm not a mph man, I look for low et's and as long as that gear give me what I want I'm happy with it.