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I have worked on a few with spun bearings or other catastrophic failures with out any visable damage to the turbos. It, I suppose would depend on, to what degree the failure was. Your oil pickup/strainer will catch most pieces of debris not all of course. It would I suppose, also depend on how long a person would try if possible to run the engine knowingly or unknowingly after said damage occured. But why do people build the z engines with forged internals.......... extra insurance. Ash was speaking mainly about left over metal bits from the machining of a built engine  getting through to the turbos and the filters being an extra precaution. 
" I told my son, you have to catch the football other wise this just  looks like child abuse." - My brother  | 
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