3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
You would have a dead cylinder pretty much. If that lifter isn't rising to drop the valve, then you've essentially lost a cylinder and the exhaust would skip/pop sound. If the exhaust valve is stuck closed let's say, you'll get backpresure in your intake and it'll run terrible and effect the other cylinders. If the intake valve is stuck closed, you'll have a dead cylinder which causes the opposite cylinder to work harder.
These trucks NEED 89+octane or chances are after 80kmi or so of 87oct and all the pinging associated with the cheaper gas can cause and will eventually put a hole in your piston. I'd do a compression check for that. A leakdown test for the lifter to checkand see if the valves are opening/closing. Pressurize the cylinder on a leak down test and rotate the engine one way to check the intake valve(you'll hear air in the intake) and then rotate the other way to check the exhaust valve(air out the tailpipe) It's pretty easy to check. You will likely need an extra ear for the tailpipe.
Through much help by people here and determination THE TRUCK RUNS!!!
I replaced the lifters( I did not soak them beforehand), and used assembly lube.
I put everything together and went to put cooland in and coolanr ran our from between the head and block. * Dumb@ss moment: I flipped the gasket the wrong way. Had to drain refill oil and coolant.
I did the whole thing again, new head gasket of course. Put everthing together and it RAN! Ok it had a tick that made me think I did something wrong. I pout sea foam in it and ran it up and down the street a few times, the sound went away.
Now all that's left is another oil change (since I got coolant in just about everywhere thanks to the gasket mishap) and a few minor thing and she is back on the road.