I went and had my car dyno'd this past week and when the RPMs got to 4500 the horsepower stopped rising. the horsepower from 4500 to 5600 RPMs only went up 2 or 3. I have a stock bottom end, 350 Vortec heads, RPM Air-Gap, Comp Cams XE268, MSD ignition, B&M holeshot 3000 stall, dual 2 1/2" flowmaster. I don't undersatnd why the power would stop when everything is rated to 5900 or 6100 rpms. Any feedback would be great.