Iron(III) oxide or ferric oxide is the inorganic compound with the formula Fe 2 O 3. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare, and iron(II,III) oxide (Fe 3 O 4), which also occurs naturally as the mineral magnetite.
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There's a lot of confusion surrounding the various factory cylinderhead designations on FE engines. With many aftermarket intakes being marketed as "high rise," it only made things worse as every parking lot hot rodder and online merchant is convinced that he has a real high riser on his hands.
If your FE is running dual quads, I recommend the Blue Thunder dualplane or the Dove Tunnel Wedge single- plane. Both have a factory appearance, with the Blue Thunder being restoration-style muscle and the Dove being a bit more race-car oriented.