Ok, i'm fairly new to the world of engine building. I have a 350 i'm gonna be building with a buddy of mine who knows what he's doing....the cam he gave me today has a Duration of 292/292 and gross lift of .480"/.480". Now looking at the lunati cam website (it's a lunati cam) the rpm range is 2000-7000. Just wondering what duration and gross lift mean and how that works and what the 292/292 and .480"/.480" means. I just wanna know what it means when he talks about it or I see it on paper.