I have very limited knowledge when it comes to the camshaft design as far as lift and duration and such. I know what they are and how the cam itself works, but my knowledge pretty much stops there. I just ordered my custom grind from cam motion today and he gave me the profile for the cam and it will be .554 and .525 for the int and exhaust. I'm just curious as to why such a difference in lift between the two. Anyone know for what reasons that would be?