My "L" Classic Rock test ball had the pin out 2 inches from the cg and had about 2.75 top weight before drilling. I drilled this ball with basically a 4X4 layout. With my low track, this ball will look kinda like the following:
O O P
+ cg
O
This is very crude, but you get the idea. Pin is about 4 1/4 inches with the cg in a strong or stacked position.
For me this ball has great length and a very snappy back end motion. The motion is continuous through the pins, which I like. The ball hit very hard. In the box finish, which is shiny, the Classic Rock seems a little limited in it's effective use range. The shiny got it down the lane, but it seemed to flare so much that it was trying to roll early. It seemed to get an over/under reaction on fresh oil.
2 things:
1. Just a little surface, red scotch brite by hand, made this ball much better on fresh/oily lanes. I just could NOT stop striking! No over/under. Good hitting power. But like I said, the high flare tended to dry up the heads.
2. Using the ball shiny when there is still some head oil in the middle and the rest of the lane has broken down some, this ball has terrific area, back end motion and hitting power.
I like this ball, but, why? If you shine the crap out of your Rock On, then you have a ball similar to the Classic Rock. If you dull up the Classic, then you have a Rock On. Too similar for most bowlers. I think this ball is pretty nice, I could use it well on different lane conditions with the proper surface adjustments. Had great power and carry. Cleared the front part well on oil, but was a little jumpy when the fronts went away.
BTW, this ball tested on Brunswick synthetic lanes on most all lane conditions available.
Hope this helps ya.......
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Mike Austin
Mike Austin's Precision Pro Shop
Houston, TX
strikes4days@aol.com