Heads

The x’s are good if the price is not crazy. You can get almost the same flow out of any of the other cheaper open chamber LA heads as you can get out of the x’s. Difference being 10-12 CFM at a serious port level. Unless you have to run or are emotionally attached to running a cast iron head. There are better options. Especially if you need to rebuild the cast iron head. It is probably a better idea to save your money up and go aluminum from a respected porter. Not necessarily for the performance, but they would usually have gone through the head and made sure it was ready OOTB when you get it from them.