Quote: some after market cranks put knurls in the crank, but I can't figure out why. .......The knurl is there if you're going to use a rope seal, and who does that??? (that shows a company that copies something and doesn't even know why it's there) My Source crank was knurled there, so I had it ground off while being indexed......
I believe the knurl is there to direct the oil away from the seal. Many stock cranks have this from the factory, my BB Buick did.
.......The knurl is there if you're going to use a rope seal, and who does that??? (that shows a company that copies something and doesn't even know why it's there) My Source crank was knurled there, so I had it ground off while being indexed...... 
Many stock cranks have this from the factory, my BB Buick did.
