Mopar Manipulatin’ , HRM August ‘69

A56 said

Were these 383 motors dyno'd in the cars? We all know that the 383 in an A body suffered miserably due to the restrictive exhaust

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No, it was an engine dyno, same kind of dyno test as the 340 a year later. And not to be a butt, and I well understand the "conventional wisdom," but I would dispute that the A body 383 "suffered miserably due to the restrictive exhaust."