While I don't go to quite these lengths, this process should get you the most length:
Using Abralon, Siaair, wet/dry sandpaper or NEAT pads, use the full spectrum: 500 grit, 1000, 2000, 4000. Then use either a White Trizact pad or a newspaper to take the 4000 grit to the 6000 - 8000 grit range. Except for the newspaper, use as fresh a pad as you can get for each step. Use 45 seconds to a minute on a side, keep firm pressure. Make sure each grit level's lines are removed by the next grit level's application. Use water on each pad religiously.
Next take a polish with a slip agent. Valentino's UFO is the one I prefer, but Control-It or Delayed Reaction will work. Apply at least 2 heavy coats on 4 sides. Wait 1 - 2 hours between coats.
For the most part this process will make most balls get as much length as this ball, the lane and oil on which you're bowling, and you (your release, ball speed, etc.) are capable of getting.
The slip agent polish will also reduce the backend and the overall hook of this ball.
Keep in mind that, if you use too strong a ball, there are many weak balls which, with a light polish, may very well get you more length than a stronger ball, even when using the above process.