What does "Stacked" mean?

[Tony Banks]

If someone says that a ball is drilled stacked, I'm guessing they're not talking about stacking it on top of another bowling ball while drilling it. Can someone please clue me in as to what it means, and what type of a hook a stacked ball will produce? Also, mass bias in the strong? Lamen's terms would be appreciated. Thanks!
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Look for me in the upcoming PBA Tour! I'll be the guy in the back row with the foam finger singing "Take Me Out To The Ball Game" during the 7th inning.

[TWOHAND834]

Stacked basically means that on symmetrical balls, pin placement and cg placement are same distnace to your PAP.  On an asymmetric ball, the pin and mass bias are same distance to PAP.  Ball reaction depends on which stack you go with.  Stacked leverage is 3 3/8 by 3 3/8 from PAP, which gives you the most overall hook out of whatever ball you drill since you are placing the core at its' most unstable position.  A 4 by 4 drill is going to go a little longer down the lane with a smooth arc reaction.  A 5 by 5 is going to be a little more towards a skid/flip type of drill.  I am sure someone else can get a little more technical than I, but I tried to simplify it as much as possible.  Hope this helps.
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Steven Vance
Atlanta (Buford), GA
Pro Shop Operator
Advanced Bowling Solutions

If anyone out there is worried about the scores being too high, try duckpin!!

[shelley]

As TWOHAND said, the pin and CG are the same distance from the PAP.  For most people, that means that if you draw a line from the pin (small colored dot, about 3/8" across) to the CG (a punch-mark, center of the label, concentric circles, or some other small mark a few inches from the pin), that line will be almost parallel to the line from the bridge to the center of the thumb hole.

MB in the strong position means, for most, that the mass bias mark (a picture of the core for Track/Columbias, a small white pin for Brunswick, Lane 1, Morich, "RAD" for Storm, a Bomb for Ebonite/Hammer) is an inch or so to the right of the thumb hole, possibly an inch or so down as well, depending on where the PIN is.  MB-strong drillings usually have a very strong move at the breakpoint.

SH