A buddy of mine overheated his truck. It's an 03-04 Ram with the 4.7 in it. Pretty sure he warped the heads on it. Are all 4.7 heads interchangeable? Also, anything special about doing heads on a 4.7? I'm more familiar with GM stuff...especially LS1's. The bolts on the LS1 are torque to yield bolts....are the head bolts on the 4.7's TTY? Any other tips or advice you guys can give me would be appreciated. He took the truck to a local mechanic out there and they told him he needed a whole new engine....not sure why they told him that. He said the truck still ran...just ran badly. I'd like to check it over before having him get some heads for it but he's about 5 hours away.