I touched base with my Wiseco contact: Hi Trent, The skirt breaking off like that is really strange. Excessive piston to cylinder wall clearance could cause that. The piston would be rocking in the cylinder. If the piston came into contact with something, that could also cause the skirt to break off. If you’d like to send them to us, Harvey here could take a look at them. We could send them down to the lab at the factory for review. Best regards, Adam Silverthorn PMI Canada / Wiseco Piston Canada