im having the same problem,. this happend only when i over reved it to 10K RPM as i didnt know casue i have a rev limiter remover...
from now on im not removing .... f**king dangerous when u are rev happy u dont look at the guages ...
I think u need a new BOTTOM END for sure... usually its bottom of the engine that makes the knocking sound ..
crouch down and listen ,when u turn the engine off you should hear rattling noise like metal clucking settling sound.
If u hear that u need a new bottom end , just buy a new bottom end with everything and bolt it to the engine
much cheaper prob cost u a good 2 Gs labor included.
Im going to do that soon myself , as of now oil pressure boost and everything is normal.
I havent checked the compression yet but will do soon.
Let me know if u hear that noise i mentioned.