Thanks David and Shawn. I'm running a ATI 9" converter flash stall is 6200/ brake is 6050. I can't quite remember what the RPM drops to but I believe its about 6400, shifting at 7200 and crossing the line is 7550. I tried shifting at 7400 but its border line of no change and slowing down.
I saw an interesting articial on the Pro Topline 360 heads
http://speedtalk.com/forum/viewtopic...line+bbc+heads
and it seems to be a preference thing ????? If you get a chance to read the responces, I'd be curious to see your thoughts on what these other guys said.