Guys, the heart marking is NOT THE MASS BIAS. The heart is the INTERMEDIATE DIFFERENTIAL, which, with this unique core design, has more of an effect on the motion of the ball than the actual mass bias. The ball was created this way to avoid weight holes for fully leveraged drillings, giving the bowler the luxury of having the most violent drill pattern without having to punch extra weight holes in the ball (especially with the USBC's rumblings of making weight holes illegal).
The intermediate differential marking on the No Mercy is roughly 6 3/4" left of the actual mass bias, FYI. But marking the mass bias and drilling the ball based on that is not a good idea. Follow the DRILLING INSTRUCTIONS. If you drill based on the MB, then you won't be able to take advantage of this balls full potential. The intermediate differential is the key.
-SLOP-
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"Amateurs practice until they get it right. Professionals practice until they can't get it wrong."