I think a lot of these issues are caused by engine builders not SETTING ( or seating ) the thrust bearing properly during an engine build and correcting if needed the thrust bearing clearances. With more and more engines going together with NEW after market cranks and bearings made who knows where this area needs SPECIAL attention.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time