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There is a safety factor in engine design. The redline is 7.4k. I'm sure the engine is designed to run safely well above that.
I don't work in automotive, but I'm sure engines undergo some rigorous testing.
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Vortech SC on 9psi Pulley, Invidia Catless Front Pipe, Invidia N1 Catback Exhaust 
242whp/197ft-lb on Mustang Dyno (91 octane water)
284whp/223ft-lb on Mustang Dyno (E85)
Delicious Tuning |