A big reason many do not run the specicfic Mopar purple cams is that for awhile the quality was not there. Lobes wiping out during break in periods as well as non exixstent/rude and or non knowledgable tech service. I have had 2 Challengers 440s with the 509 cam. They both had 3000 stall converters and 4:10 gearing. Very powerfull. Being able to use/re use the stamped steel rocker arms ($$) has always been a mandate for me. For my future 360 build I have a new Engle mopar specific 230deg 514 lift cam under my bed.