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If you have an issue with rod bearings, the noise will be present only on decel. Also, unplugging a coil/removing a spark plug boot would make the noise disappear as there is no ignition in said cylinder thus causing resistance to the rotation of the crank and rod. In my case, which is SR related, I had a few things going on. I had beat the shit out of that motor so the bearings were finally beginning to bronze from the abuse so I am thinking that some of that material was causing some blockage of the passages. I was also having the noise faintly at decel. It's hard to determine the noise and cause online but in my case, I had both a noise from the rod bearings, albeit faint due to the fact it was a material worn away versus a spun bearing, and noise from the cams from improper lubrication because of oil passage clogging. I simply picked up another SR long block with a new crank and bearings for $500 and slapped it in.
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