Please note that I don't do this for a living... I never saw wear only near the tang before.
10.5:1 CR RB with 4.15 stroke in a 73 barracuda I purchased last year, I don't think the previous owner drove it very often, but when he did I suspect it got beat on pretty hard.
I took it apart because I found the #3 cam bearing spun during a cam swap and the more I look the worse it gets.
The crankshaft has no visible wear.
Main bearings are also in very poor condition, but do not have this concentrated wear by the tang, they just look bad everywhere.
Wow....Never had a set come out looking like that...And we have run a lot of their kits. Myself personally, I have had 4 engines with all 440Source parts and never saw anything like that.
I would say it almost looks like the tang fit too tight into the tang relief of the rod. Like the relief was too small and didn't allow the tang to fully seat before applying the full torque to the bolts.
The other wear at the edge of the bearings looks like bad some bad machining.
