Gnarly,

Thanks for the data! Very interesting. I would say it confirms what I have been thinking regarding the 2 cams as I drive my new motor a bit more. My butt dyno thinks the previous truck may have had a little more oomph right off the line. Only up to 1500 or so, and than this current motor just takes over, probably due to the OS valves.

It is a bit surprising that the 261 is so weak off idle, compared to the others. Mainly because as for drivability in my setup, I can't really ask for anything better than what I have. (Probably because the 35/5.29 combo is a little lower geared than stock.) I barely have to touch the gas starting from a standstill, she does not want to die.

Certainly, it looks like I would be doing even better if I had the 252 in there right now, but the extra $150 or so I would have had to spend makes me okay with my decision right now. (For now, haha.) My main concern is the 3-4.5k range, where the 261 and 252 are nearly identical. This is the high-altitude interstate pass-climbing range. Since my gearing is so low I am not concerned with torque under 2k.

Soo... With your motor... What is your plan for figuring out the issues?