1990-1996 Legacy/Impreza AT vs MT Heads differences

[vwilson]

I have a 1996 Impreza MT EJ22. I don't have the car, just the engine. I am looking at converting it to dual port exhaust but have a few questions about it:

 

1. Will any heads from 1990-1995 be a direct bolt on?

 

2. I know early cars didn't have EGR but Is there any difference between heads from a AT vs MT car that would prevent me form using AT heads?

 

3. I think my current engine has Roller Rockers and HLA. What do most 1990-1995 heads have and should I swap these over during the conversion?

 

4. Would EJ22T heads work or should I stay away from those for my purposes? Is it easy enough to block off the oil ports on the passenger head for non-turbo applications?

 

Any help would be much appreciated.

 

 

 

Thanks.