Even though Ford didn’t take any Obama money, which was a good decision, they could have developed a better cylinder head than the currently available 351N heads.
If you must run a cast iron Ford head, the 351N will work well when it is modified. But, the Dart Ford 200 cc runner heads is a better choice.
In stock form, the intake ports of the 351N head flows 245 cfm; the exhaust flows 163 cfm. With our “Undercover Porting” the intake will flow 268 cfm; the exhaust will improve to 178 cfm.
See also: Complete Cylinder Head Assemblies