Quote:

Letter designation don't mean anything. Not even the J.



Ive been told the X head is a better flowing head. It was built for the 2.02 intake, where as the rest of the heads were built with the 1.88 intake and they added the 2.02 later.
Again, this is what I was told by a very knowledgable friend of mine, just passing it on to you guys. If I'm wrong, or someone THINKS Im wrong - don't string me up for it!!