We fitted a steel gear (not stell)
I was informed that MSD previously used brass, then changed to iron gears - and are now using steel gears.
Beware if you have brass carry a spare or change it to steel for a roller cam, not iron.
It is not just so easy as changing a gear on the road. You need to flush out the engine(thru the distributor hole), change
oil and then after about 100 miles change the filter to get rid of any brass gear residue.
Hope this problem helped many of you avoid the same problem.
John