Want to add a aftermarket dampener to a built LLY motor internally balance. I have keep the oem dampener since the build in 2007. After talking to a couple of good friends (diesel junky's). They told me to save myself the grief of a broken crank and leave the OEM dampener on and stay away from the heavier aftermarket dampeners. Since the build in 2007 I have continued to add more HP. Now at 851 rwhp I think it couldn't hurt to put a fluid dampener on, but have mixed fillings. I would really like a few more opinions.