Noticed this today as I was finishing up piecing together my 2.5L DOHC. The previous rebuilt motor had this harmonic balancer on it. It spun a rod bearing, so just swapped shortblocks. I'm nearing the end of the race, and curious if this amount of damage could cause issues. If so it's got me wondering if this little mechanical component could have caused the spun bearing?

 

That won't cause any balance problems, if that's what you're thinking. If you're really worried, break a chip out of the other side, too 

 

The dual cam 2.5s spin rod bearings because that's their MO, a chip in the balancer isn't gonna do spoob.

Won't hurt it any. Make sure the edge is smooth so it doesn't cut the belt.

 

The pulley doesnt really balance anything. Harmonic dampener is a better term for it.