I've owned two 4.4, a 3.0 and 4.8is in the past when they were fairly new and I'm very familiar with these vehicles. I know the 3.0 is the best of the group of reliability. I only want a 4.8is or 4.6is and my questions is between the two which do i go for? again, both have similar miles great service records 4.8is had stem seals done at 80k but i can't find anything on the timing guides for the 4.6. The 4.6 is the cleaner of the two. I need to pick one like tonight and I'm stumped. I wish someone with mechanical experience on both could chime in...