So at what H.P. and at what RPM should one begin to be concerned. I don't recall any Detroit Iron equipped with a factory installed shield. Maybe I'm wrong.
I have seen a lot of factory cars spin over 6K.

______________________________________
"Tell it like it is or don't tell it at all" 1964 Falcon 2dr HT, 347V8 4V, dual exhaust, 5sp, pwr assist R&P steering, AM radio, heater with defrost and 2sp fan, electric windshield wipers, cigar lighter, dlx light group, bucket seats, console and full carpet.