[nUcLeArEnVoY]

The serrations are there to permit a scant amount of oil through to lubricate the rope seal. There has been only anecdotal evidence regarding the serrations chewing up the one and two piece viton rubber seals. Some people say they're fine, others say they're not. BOP recommends polishing down the serrations.

The one and two piece viton seals are technically a way better and more modern design but their efficacy depends a lot on installation technique. As for the crank serrations, if I'm not mistaken, Scat cranks don't have the serrations and would be better suited for the viton seals. I would fear that completely milling out and polishing down the serrations would wear enough material away that the viton lip seals would no longer even make a seal. Maybe just polishing up the serrations to smooth the edges would work, or finding a crankshaft that doesn't have them.