They are flat. I thought about doing a bit of a convex but I do not believe it's necessary and may actually change the shape of the journal just a little.
If you are going to go much over 8k RPM they would be a good idea. Same if you were doing a big power boosted build.
If you are going to go much over 8k RPM they would be a good idea. Same if you were doing a big power boosted build.