04 is geared 16/43 (-1+4) at 63 in. crosses the stripe in 6th close to stk 12500 rev limiter at 157-158. 07 is -2+3 (15-43) at 67 in.with rev extended to 13500, crosses the stripe close to ext. limit right at 160 in 6th. 46 should work with ur rev limit. lot depends on if making power at those extended limits. 04 falls off on dyno right before 12500. 07 has different cam timing, pulls all the way with nice flat tabletop graph holding peak power until 13500. generally, gear it to peak out in the 1/4, but powerband peak is the main factor. 07 benefitted from tighter gearing, 04 would not.
Last edited by gazx10; 10-13-2014 at 07:01 AM.