Difference between old and new 22re?

[ra65]

I am under the understanding that there are a number of differences between the older (84<) and newer (84>) 22re's. I am asking this becasue I am considering just buying a new head rather than fucking around cleaning etc.

Now I have been told that the differences are the exhaust ports (round and pear shaped) I have the pear shaped ones and my car is an 09/84 car. 22re.com has a different listing for the 8/84 and 9/84 parts. However places like engnbldr are saying that the differences occured between 84 and 85.

Now this puts me in quite a predicament as I don't know what year head to be looking for and what parts to use in my engine. The engnbldr site also says that 84 should have domed pistons....I have a picture of my block and from what I can see they are not domed but I am not sure what domed Pistons look like

So...can anyone shed some light on the situation?

[ra65]

All good now. For future reference if anyone needs it...pear exhaust ports and flat top pistons means later model block/head. Earlier model has domed pistions and round exhaust ports.

So when ordering parts you get them for the 85-95 or 9/84-95 engine if its the later model.