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Old 03-28-2014, 03:11 PM
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Dwight Dwight is offline
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Join Date: May 2001
Location: Florence, AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
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a wild guess would be 5800 to 6000. 5.0 Mustang motor are limited at 6250.
A dyno chart of your motor would tell you.

I had a 302 in my Cobra for years and spun it to 6250 all the time.

Dwight
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