Cast iron

[SS427]

Albert,
If you want just a quick virgin cast iron look with a temporary protection, spray several light coats of VHT's "Copper" on the new set of manifolds. It looks really dorky until you heat the engine/manifolds up. At that point they turn a very slight cast iron rainbow look and look like virgin cast iron. They will not rust for a short period but you may want to refinish them down the road if you keep them. We used to do this on the Corvettes we were going to be showing when I worked for Corvette Specialties in the 80's. As long as they have not changed the formula since then, it worked very well.
Rick