5.9 Magnum Balance Converter Weights Information

72DMag said

@Bobzilla

Thanks for the measurements. Here is mine replicating what you measured. Yeah I know it's not as pretty but I measured all points to what you had in the thread. If census from you is that this looks about right I'm gonna go ahead and cut it and weigh it too before and after the cut.

Let me know if I should proceed. If we mess it up it's only money...... lmao

View attachment 1715756067

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You mentioned aftermarket connecting rods, so I have to ask if you matched the bob weight of the original parts? If not, this flex plate matching will likely not work.

As for your markup, that is pretty darn close. Double check your measurements and the line drawn on right side. All lines should go through the centerline of the bolt holes. Your right side line appears to use the right edge of that bolt hole, where my red line was. My lines were a little thick and that may not have been clear. After the lines are drawn, the measurements are from the lower edge of the bolt hole down to where the notch is going to be cut. This was so you can put a caliper or ruler right on that edge for closer measurement than estimating the hole center line. Otherwise, it looks like you should be good. I listed the weight in another thread on this issue and will add the link below. Final weight after cutting out the notch should be about 1389 grams total weight. Unmodified 10230 weight before cutting a notch was 1567 grams. The notch is more weight removal than the suggested 5.9 Magnum offset weight simply because it is a larger area and the flex plate itself starts off much heavier, so no worries there. A lighter flex plate with a heavy weight in the correct spot or the torque converter itself, like the factory did, uses less total weight on that point, but it works out the same when spun for balance.
Check out post 24 in this thread:
5.9 Magnum flex plate too small??!?!?!?!?