I'm looking to build up a D16 (both cuz D16 parts are cheap, and cuz it'd be cool to have a fast SOHC ). My questions are ..

Is there any difference between the Y7 and Y8 BLOCKS themselves?

I know the pistons and probably rods are different .. but I'd be getting custom stuff anyway. I just need to know whether the Y8 block is any better than the Y7? Thx.