Ford Factory Small Block Cast Iron 351N Heads

Even though Ford didn't take any Obama money, which was a good decision, Ford could have developed a better cylinder head than the currently available 351N heads. If you must run a factory Ford head, the 351N will work well when it is modified.  But, the RHS 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. With our “UnderCover Porting” the intake will flow 268 cfm; the exhaust will improve to 178 cfm.

If you need cast iron heads for your small block Ford run the RHS heads, they work much better.