Balance issues
I bought an Eagle cast stroker crank and when I put the first main cap on, I tried to turn the crank and it was locked up solid. Checked the cap, it wasnt even seated. Pulled the cap and looked at the bearings, found the crank was FORGED and had fillet radii onthe mains and the bearings were not compatible. Bad thing was the bearings didnt fit, good thing was they sent me a forged crank instead of a cast! :D