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I had a 65 dart charger 4 speed a few years ago that would rev to 7000 all day long. it was pretty loose and smoked a lot when you got on her. but it screamed...... was suppose to be an all original internals engine.
here is a video . throttle response was really really quick . theses were 5500 revs. I put the headers , x-pipe 2.5" and ultra flows on..
trimmed smoking bad reving