Pro Parts Headers on a "B" block....Pics

Mopower71 said

And my Herb McCandless ones that the collectors are stuck on.
Yes the Dart has Power Steering with a 440.

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Try P'Blaster. I have never failed with that stuff. Then, when you get them off, clean the connections off real good, coat them with RED high temp permatex and put them back together. They will never stick again.