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I am nowhere near the gearhead that most guys in this forum, so I am curious about the following:
Is the reason that these cams are so popular because their relatively low lift numbers allow the racer to retain the factory valvetrain? Most aftermarket cams seem to have higher lift #s in relation to the duration.
I was just thinking that the Mopar engineers were possibly looking to help the racer on a budget. Thoughts?

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This is true!! The Mopar engineers, as well as the sponsored racers and engine builders WERE helping the budget class/bracket racers to run stronger, back then.