Small Block Heads

harrisonm said
What is a "U" head. I thought I knew a lot about small block Mopars, and I know quite a bit about X and J heads, but I don't think I've heard of a U head.

I have had 8 sets of T/A heads and most were U on top and J on the bottom.
The casting half's could be any combo of J, U, O, or a rare Z head