Looking for info on a Manley big block cam 17383

Bewy said
That is a low rpm 2500-4500 range cam.
Specs are 292* adv, 0.512" lift, 230* @ 050. Lot of duration for the stated rpm range.

Thank you! Where did you find the info? From the little mention I did find on Moparts, somebody said they were "cheater cams".