[Dave Noll]

Originally Posted by gmonde

i have my o2,s in the collectors just at the merg and i shoot for the 13.50 in high gear @ 6000-7000 rpm ,off the line it drops to 11.0 past the 60' it climbs to11.50 -12.00,, collector readings will read leaner ,,eventually i plan to move up steam in to the leaner cylinders on each bank ,but its just a number to help you find your direction,, checking plugs will give you the best data

The AFR trace that I get out of the Racepak in my Cougar sounds similar. Depending on the shooters that are in the carb it drops to 9:1 or 10.5:1 then goes right up to about 13:1 but then it looks like the RPM/Shift trace, its not level. Using cast iron intake manifolds and uneven length headers I'd love to have an o2 sensor in each primary header tube.OR get off my butt and build a good set of headers but then theres still the intake.