So 2 days after a long road trip I noticed a new noise that sounds like its coming out of the exhaust. Between about 1100-1200rpm I get a loud tick/tat that I can clearly hear over my exhaust. It happens in all gears and only really makes the noise when I'm on the throttle, can't hear anything at idle. My only thought is my exhaust valves are out of adjustment going to adjust then tomorrow to see if it fixes it, but not sure:shrug: Any thoughts please let me know.

Worth a shot and checking the valve lash... But I would check all the exhaust piping too...

So I i reset the valve lash to spec, and checked my manifold bolts to see if they were loose, but everything was fine. So now I'm at a loss. Any ideas please let know.

Run the truck thought its paces and make note of when it does it... In gear, out of gear, warm, cold, wot, idle, etc...

You can hear it clear when it gets warmed up but still when its cold, just not as well. Can't hear it at idle, only half throttle not WOT. Can hear very clear in 5th and 6th gear but some times in other gears and like I said before it between 1100 to 1200RPM.

Check the manifold for cracks too... Some have reported cracks on the bottom.