Eagle products should be capable of the same hp potential as stock, if thats the power level you are aiming for. And Im always going to suggest taking any unknown engine part to a machinist to have them check it out new or used.
Probably i see often are triangulation ground journals. This can be checked with an Arnold gauge while rotating the crankshaft. The Arnold gauge shows actual runout differences of the journal roundness where as a micrometer only measures distance across. Micrometers might catch issues with the journal, but can also be over looked as good due to the high tolerances and minimal capabilities of the measuring tool. But with an Arnold gauge, it will show differences of the journals roundness.
Their may be a trangulation runout acceptance tolerance standard, but i dont know if that exists or what that is. One would think a machine capable of holding a perfect round tolerance would produce a near perfect journal, but humans and our inherent inability to be repeatable did set up the crank in a machine and any debri within the work holding, loose bolts, or steady rests not set properly can cause problem like described.
