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Hi, Kerry again,
When a diesel smokes black, it's usually un-burnt fuel.
This could be caused by leaking injectors, bad compression or a bad turbo or blower.
A bad turbo will result in loss of power and black smoke.
Can you give me more details about your engine, turbo, blower, intercooler, etc.
So the side with new injectors is blowing black smoke at high RPM, is the black smoke the reason for the new injectors?
I mean, was it blowing black smoke before the new injectors and this did not fix it?
Read the question again, it sounds like the engine over-heated, you may have leaking head gaskets.
I think you should do a compression test.
You said it was getting hot from the port manifold, does it still get hot or did you solve that?