Listen with a broom handle, stethoscope, screwdriver and see if you can determine where the sound is coming from. I don't know anything about the LS cam issue but if it's a rod knocking it will be the loudest under a heavy load. Since you have a manual trans the only way to load the engine is by driving it. Just get out on the main street and put it in third at a lower rpm and give it some throttle. If it's a rod issue it will rattle loud.
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