5.7 hemi

03-08 are known for dropping valve seats(extreme over heat condition), weak oil pumps, and bad timing tensioner. I've seen the effects of all these situations. In general, they are very decent engines. I have two half ton trucks(an 03 and an 08), with 97 thousand and 178 thousand miles respectively. Both have been maintained properly and often. Just like any engine ever made, if it was taken care of you'll be fine. If not sure, tear into it. They are relatively cheap to put back together.