I just pulled my intake manifold off in and found that one of my intake runners has alot of carbon build up. All the other runners are pretty clean. I have attached pics please need to know why this is like this.

 

suppose there`s some clearence between intake valves and seats so combustion gases strike back into IM

 

Thanks that makes sense. I pulled the head off the car and found 7 bent valves. 5 intake and 2 exhaust. Would a bad piston ring cause this?

 

no, not likely. not a piston ring, as that would head out the other way, into your exhaust (blue smoke etc...)
Those bent intake valves are your culprit. I bet the cylinder with both intake valves bent is the cylinder with the greasy intake runner....correct?
It is simply as kyky was saying, exhaust gases escaping upward the wrong way. Your ride must have been runnin' like a real bag o' **** with that many bent valves!!!!

 

usually valves are bent after "meeting" the piston. i.e. when timing belt is torn, cam stalls leaving some valves open, but crank makes several more revolutions

 

well some of them got bent after i changed the cam gear from an aem one. but the only piston that doesnt have marks is the one that had the dirty intake runner. The car did smoke alittle under heavy acceleration. But i was told it was more white.