[blykins]

True, but there could be inconsistencies in the intake that would warrant a different size jet on the passenger side than on the driver's side...

I used to work at an engine lab....the engine builders there would sometimes have to jet differently from one side to the other (seemed more common on Demon carbs).

It could be a difference in shape in the intake runner....cast flaws.....could be anything.

If you don't have any gasket leaks, there's only so many explanations for why it would have different A/F ratios on each side...