[Keithc8]

If everything is equal, such as flow and chamber volume you will get more power out of the iron head because of the heat retention. You can not port the cast iron heads as much as you can the aluminum heads and they will not flow as much. The cast iron heads I have were not done by me but look to be nice heads with all new parts. There is no major port work done just a little bowl work. These 428CJ heads should be goos for about 500HP on a 10 to 1 engine with decent camshaft. These heads will flow real close to the Edelbrock heads out of the box. Thanks and good luck, Keith