Dogtown,
The changes for weight would be slight is what I said, and I stand by that statement. Practically, unless you are the THROWBOT, you will not be able to tell the difference in reaction, but thanks anyways.
To everyone, quit looking at "numbers only" to determine ball reaction. The number one contributor to ball reaction is what the bowler does to the ball, speed, revs., rotation, tilt, etc. Second is surface (cover) characteristics. Third is core design and layouts. Do you really think a bowler can tell the difference between 2.54 and 2.57?