Cast iron exhaust manifold cleaning

Now I’m curious….

Do any of the products and methods mentioned above work on headers? Can’t say that I’ve ever seen a header that didn’t look like crap.

And my apologies to the OP for somewhat highjacking this thread.
Nah, you're good PB. I 100% agree regarding the headers. As you can see, mine do. And I'm pretty confident I had these zinc coated way back in the day. For anybody assuming that's because of age, they look like this within a few years of being done. It's a different time now and I'm a different person so trying to get this car back to stock for the most part. On top of that I remember what a nightmare these headers were to install, needing to partially pull the motor up to squeeze them by everything and denting one of the tubes in the process. They suck to get the starter out also.

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