Ej257/205 Hybrid build questions
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This is a discussion on Ej257/205 Hybrid build questions within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hello everyone! I posted some threads before about my blown engine on my 2003 wrx. I had a few ways ...

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    Ej257/205 Hybrid build questions

    Hello everyone! I posted some threads before about my blown engine on my 2003 wrx. I had a few ways of resolving my problem so I have decided to go with a hybrid build. The reason is because I got a good deal on an Ej257 short block. It has a small rod knock but hey - it was $200 . It has under 60k miles and came from a 2008 STI.
    Question: So I am kind of confused about this whole hybrid thing. Some say there is a need to curve into heads in order for them to match STI's combustion chamber. Others say there is no need, or just use a spacer (thicker head gasket) or special Pistons. So which one is it?

    This isn't the only concern about this build. What other things should I look for? What other problems should I expect?
    My budget is really low. I am not looking for anything big for now. I might go with bigger turbo (probably tdo5) bigger injectors, fuel pump, uppipe etc. Thank you for your input!




    Additional Questions: Does an 08 ej257 any different from the previous years? Will my stock wrx mounts work okay? Any additional things to know?

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  3. #2
    Moderator Donkey's Avatar
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    No need to redo the combustion chambers on the heads,but they do improve power and driveability. Most just use a thick head gasket to offset the compression ratio.
    Resident Adviser @ WTF Tuning, LLC
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    Subaru Newb MainFrame's Avatar
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    If you're on a tight budget, running a thicker head gasket will do just fine.

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    What size gasket should I use then? and where can I get it?

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