I dynoed 349rwhp and 362rwtq on the motor. With a 125 shot it made 429rwhp and 549rwtq. After 4000 the hp went down and ended up at 300 at 6000. The torque was flat though the entire rpm range. It let out a huge backfire when he back of the gas. The a/f ratio read 11.5 but, the monitor at the dyno has been way off in the past. It was on pump gas and 26 deg of timing.
Any ideas? I didn't have time to look at the plugs or hook up my wideband.

 

well i would say it sounds like it ran lean.

 

the tq isnt bad but I've heard of the 4.10's giving lower hp readings in the past, get to the track and find out what the performance really is

 

what was your bottle pressure at? was it a wet or dry shot, was it getting any knock?