[Loadco]

I'm running a tunnel wedge on a 427. I recently purchased the Innovative Motorsports LM-1 A/F ratio meter. Have spent some time getting WOT A/F ratio set. All my testing was done with the O2 sensor in the pasenger side pipe. WOT A/F on the passenger side is 13.2. I switched the sensor to the drivers side and the WOT A/F is richer at 12.1. Has anyone experienced this. I am sure I have no exhaust leaks or intake leakes that would influence the results.