Anyone run high-flow Cats to reduce hydrocarbon exhaust smell?

Is it reading timing off of a distributor or a crank sensor? If it a crank sensor then....ok
If it is reading it off the pick up of the distributor, it's not capable of that kind of accuracy.

Not trying to argue with you just trying to figure it out in my own mind how we get all the extra oxygen in at idle with a high duration cam.
I have said the same as you, that the overlap is why. But now i just don't agree. it's not going from the intake thru the exh at idle, it just not. So now i'm trying to theorise how how it's all happening.