/forums/images/graemlins/1zhelp.gif /forums/images/graemlins/angryfire.gif I have been chasing a noise for about 2 months and I need some ideas. The noise can be heard at 3800 rpm or more while driving or just reving it up in the driveway. /forums/images/graemlins/ears.gif The noise sounds very similar to a valve train tick or an exhaust leak or even a bad water pump bearing. So far I have replaced the lifters and cam, valve springs, oil pump, pilot bearing, clutch release bearing and I did have a cracked exhaust manifold so I have since replaced them with T.E.S. You cannot hear the noise while standing over the motor and reving it. the noise is best heard from inside the truck or under the right side of it and reving it to 3800 r's or more. I have thought that it may be a wrist pin or a bearing but I am inclined to beleive that if it was either of those that the noise would be heard at all rpms from idle to WOT and would be much louder and identifiable. And would be heard under load such as driving up a hill. I have used a long pipe and placed it all over the block and heads trying to listen for it but to no avail. It doesnt effect driveability and it doesnt lose power when the noise occurs. I also have a centerforce clutch kit. Has anyone ever heard of the weights on the pressure plate making this type of noise at higher rpms? I am grasping at straws here, any ideas? Thanks in advance for any help with this.