I was told at time of purchase.. 60 mm roller or bigger was doable in this block bye kent. And that's why everyone that seems to be doing these right now are doing a 60 mm
Because typically bigger is better
. We don't run a huge camshaft in this so the 55 mm could get us to where we needed to be with no issue.
I have seen a half a dozen or so of the Generation 3 blocks the quality does seem to be getting better and they have made some needed updates by looking at all the other manufacturers this block should be able to support 2000ish In my opinion. But there is definitely a weak spot under the cam bearing. Which you are correct is above the main... this block has not had an easy life it has been raced hard. And it gets turned over 9,000 RPM . But we are under 1000 HP. Maybe these cracks . Will only happen to this block I hope so I wish the best for everyone else because we really do need a good block to base Are build on..