Welcome aboard, you came to a great place. You will learn a lot from a group of awesome Hemi owners. About the cam and lifters, we have had a number of cam and lifter failures over the years, do to poor quality parts or poor quality oil. But I think it's both. Either way the Hemi is picky when it comes to engine oil. Pennzoil Ultra Platinum (PUP), Amsoil Signature Series and Redline are the 3 top oil being used. Tell us about your truck, miles, oil change interval (OCI), oil preference, oil filter preference, year? You having any issues? What warranty do you have?