Sitedrifter

Are the exhaust manifolds on the 2013 5.0 cast iron or cast high silicone moly? Mine sure look like cast iron but checking out videos on Fords website (and the engine specs) it says High Silicon Moly. I would not think Silicon Moly rusts like cast iron if in fact that is what I have.

engineermike

"High silicone moly" is simply an alloyed up cast iron. Its just an improved version of cast iron, probably to improve ductility, creep resistance, and corrosion resistance.