[jdean]

Rick, I did not take it you were picking on me, in fact the opposite since you just added more stuff to support the point I was making which is that indeed there is 15-20% loss and sometimes more. Dont forget that automatics consume even more.

I totally agree with you on the LM-1. I installed an O2 bung on my Cobra, and used it to verify my AFR at cruise, transition and WOT to be sure things were efficient as far as making the most power. I am helping with a 289 build right now and have already installed an O2 bung in it as well to use the LM-1. If you use the LM-1 and get the AFR tuned correctly across the RPM range. along with optimizing your timing curve, I think this is money better spent vs. a chassis dyno.