Any one tell me what a closed deck block is?
I've been told early wrx's have them -MY 93?

WW

 

I kind of refers to the amount of metal around the bore liners, closed deck have lots of it and small waterways, open deck don't have very much of it and larger waterways, semi-closed-deck is somewhere in't middle.

Or something like that, I'm sure someone else can give a better description

 

There's a good picture here...