Ok, I can see why you're confused. The pistons are bank specific. In other words, the right hand bank pistons are DIFFERENT than the left bank pistons. That's why the pistons Toolman just got have a right bank and left bank set of four each. The pistons for 2, 4, 6 and 8, if you're looking right at them, have the pin offset towards the CENTER of the block. The pistons for 1, 3, 5 and 7 are offset towards the OUTSIDE of the block. That way both banks have the same offset towards the driver side of the car. By swapping banks and installing them backwards, the offset of both banks are now towards the passenger side of the car. The reason for right and left bank pistons is not for the dome or flycut valve reliefs, both reliefs are the same size.
Check with Toolman on his new pistons, and yes, it can be confusing.
Russ.