[derotoreut]

First of all the noise is only evident when the truck is under load. It will not make the noise when it's idling or revved up when sitting still. When given throttle under load it is like a knocking, tapping kind of noise. That's one of the reasons why it's so hared to find, because it has to be moving and the throttle stepped on (but not even stepped on that hard).

I have investigated exhaust leaks at the headers and collectors. I'm sure there are none. I also looked at the flex plate and know it is not cracked. I checked the torque converter bolts to make sure they were tight. This go-around I even replaced the torque converter. I thought maybe it was something from the accessories like maybe A/C compressor, alternator, PS pump or even water pump. I ended up removing my serpentine belt just for a quick ride to find out it wasn't anything related to the front end belt. I looked into the timing because I thought maybe it was detonation. My timing was all good. I even checked the spark plug wire resistance and changed out the wires and plugs.

When URE built the engine it was run on the dyno and fully broken in when received. Upon receipt this engine should be able to be run right up to 6000 RPM with no problem. I have curves, graph and video of the dyno from the original build and the second rebuild. The only thing they were able to find was slight play in the wrist pins. They changed out the entire rotating assembly with new crankshaft and pistons.

When I had my original 305 engine installed, it did not make this kind of noise. That's why I thought it was something related to the URE engine. The only other thing I did was to install a cast aluminum deep transmission pan, with filter extension.