My FAST portable wideband wouldn't even read my air-fuel ratio at idle. It's beyond it's range, because its too rich. I changed my cam and compression, and am a day or two away from seeing if it will read it with this one.

1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)