what are the tolerance allow for pitch difference on Props .
On a former post some one said tha 2 blade difference had an advantage.
I have notice that most of the time 2 or 3 blade props are not (EXACT) the same, could that be why every time one repitch a prop that one might work and the other just not the same?

There is more to it than just pitch, try dia, blade area. thickness, and the stiffness of each individual blade. They
all have to be the same.
In years past we would work 10 to 15 props at a time for slow rat and found that even working the props for blade width,thickness and pitch at 1/2 inch increments that 7 or 8 would be acceptable to race with 3 or 4 would be ok to use for practice on rough fields and the rest would be epoxy stirrers.
I have found that the Bollys are easier to make acceptable props that work most of the time.
If I have one that is less than acceptable ,I will just save it and use it when I go to Marietta.