c14nz

so recently my engine (C14NZ) made a weird noise, it's not any form of engine knock, it kinda sounds like it's scrapping or boiling. the engine has oil. it sounds like its coming from the cam cover. The engine still runs like it always has ran. any ideas?

I'm not exactly well knowledge with car mods, but a friend of mine mentioned getting a carburettor... as a joke ofc and I thought about Individual throttle bodies, now would getting an ITB's for a c14nz be beneficial in terms of horsepower gain, or am I complete dumb idiot for thinking such...