360 LA rear main seal needed....help

I too have used numerous Fel-pro rear main seals over the yrs. and never had any problems. Did you seal the back side of it with silicone or an anaerobic type sealer? They recommend an anaerobic sealer but I've used both and had no problems with either. How about a super thin dab of sealer between the ends? I always do and they have never leaked on me. Are you sure you installed it the right way? Lip facing forward.

As far as I've seen there's knurling on all cranks. It's to sling the oil away from the rear main I assume.