Mopar Performance Purple Mechanical Camshaft

Mopar Performance Purple Mechanical Camshaft - P4120653AE Cam Card

rustycowll69 said
I disagree. I think it doesn't matter where manufacturer, "X", wants to start measuring duration. If they give you a recommended installed lobe centerline spec and a duration spec you can derive the events for whatever their particular method for measuring is, as long as the opening lobe profile and closing lobe profile are mirror images of each other(symmetrical about the lobe centerline).

In your previous post you didn’t mention what is now mentioned and now it works OK. This was the point I was making in which in disagree with you but suddenly you make adjustments to your statement. Which suddenly makes you right. Saving face in this manor is pretty crappy. Sorry, I thought I’d see better.

70aarcuda said
I can tell you from my experience with MP cams...all the durations @.050 are incorrect. They are calculated number
I have used many MP590 cams for small blocks....MP shows 265 @ .050 my degree wheel shows 271 duration @.050

Same with the MP557 cam....MP 252 duration....my degree wheel keeps showing 258 @ .050
As said put in an engine and run a degree wheel on it......only way...

Thanks! This backs up a lot. I remember you saying you used these grinds years back as well. (Correct?)
Did you by chance also degree wheel them with same/similar results?

RustyRatRod said
Mopar's attitude was, they gave us all those recipes in the MP engine book......I know you remember those......and I think their attitude was, "just pick what we say will work for your combo and shut up".......and honestly, if all else fell into their recipe with "whatever" corresponding camshaft you chose, it WORKS!

In the end, isn't that all that counts?

I never read someone ***** it did t perform at a minimum of what the book tips said it would unless they screwed up and people have the LMAO balls to call the book a bag of bull **** stuffed with lies. Which never made sense to me. Even more so because I was coming from (supposed) MoPar guys.