Sorry to dig up an old one,...
but i'm trying to do some research on my recently acquired YB.

Mine's got the coscast, V86HF 6080AA and YN0627.

What's all that stand for?

Dan.

Sounds like a 2wd head...does it have 2 or 3 thermostat housing bolt holes?

think it has three, will check tommorow.

If it has 2 bolt holes it is an early 2wd head, if it has 3 it is a late 2wd head

Thanks Phil

YNO627 is a RS500 crate engine head.

Should explain it a bit better YNO627 "Ford" logo is RS500, "Cocast" is crate engine. They all came on the upgrade small plug 205 blocks.

"Ford" heads had dowells for the inlet manifold "Coscast" don't.

YNO627 heads had minor upgrades over early heads however they still suffer from the open water jackets on the flame face, only 4WD heads have a closed face.

Quickest way to see which head is which is all 2WD heads have turbo damper mounts cast on the exhaust side of the head and no 4WD have this.

Here is another one guys.... 2wd 3 bolt CosCast Head with these numbers V89HF 6090AA YN0643... Found on top of a DJR 205(88H with the small core / welsh plug holes) blocked motor in a sports sedan....