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Originally Posted by 3 on the tree
I read somewhere that Chevy did it to pick some of the lost HP from new emission controls-but they still called it a 396 in the Chevelles, but my 72 Burb had 400 emblems on it.
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Reason they used the 400 emblems was to appease the insurance companies. They were also under-rating many of the musclecar engines at that time.