Purple Cam Design Question

StrokerScamp said
The Mopar Purple cams were all redesigned in the mid 1980s to take advantage of the .904 lifter diameter. This is actually in print in the latest edition of the MP engine book.
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In addition, didn't some folk here work around these cams only to find out the Lunati cams have a larger duration @ .050 than the MoPar cams?