[Henry Schmidt]

Magnaflux
If this crank was installed 10k miles ago, there is little or no chance this crank was not cracked before installation. I have seen more and more cracked 3.2/3.3 cranks lately. Cracked cranks in the smaller sizes is almost unheard of. Don't get me wrong you must always magnaflux for cracks, but early cranks rarely crack.
Now why are 3.2 and 3.3 cranks cracking. Remembering that I am not an engineer, I would say that twisting loads created by horrible rod angularity is the culprit. We are also seeing cracks in cranks that have spun bearings. Often when a rod bearing losses lubrication you see great amounts of heat. this heat warps the crank. Crank shops repair the crank and during the repair process they have to straighten them. This is an interesting process. The crank grinder will locate the crank in centers and measure for the high spot, then with all the technology available to engine builders today, he takes a big hammer and a V shaped chisel and then just beat the hell out of it. The hope is the crank gets straight and does not crack. If this crank was repair because of a spun bearing, it is likely that it was pounded straight.