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Old 04-29-2013, 01:05 PM   #1
PinkSTI550CC
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Default Ej22 with Ej25 Head.

Can i use EJ22 short block with ej25 sohc head? Just for a good running engine.
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Old 04-29-2013, 02:17 PM   #2
cal_look_zero
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You can, but the compression ratio will be lowered some, so it will probably make less power than a stock ej22
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Old 04-29-2013, 03:42 PM   #3
Storm
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What years are you working with? Phase II EJ22 and Phase II EJ25 heads share the same combustion chamber, valvetrain and timing components. Compression will not change in that scenario.

Phase I EJ22 heads had a smaller combustion chamber and would therefore lose a slight amount of compression. Not enough to notice.


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Old 04-30-2013, 09:05 AM   #4
PinkSTI550CC
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Phase 2 EJ22 because of the single port, EJ25 is from a Legacy 2000. I just want to know if i can keep it as a spare motor.
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Old 05-02-2013, 12:20 AM   #5
Storm
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There are still 2 types of single port EJ22 heads. Do yours look like EJ25 heads (can you see the headbolts with the valve covers on? If you can see them, it's still phase I. If they look like EJ251 heads (big flat valve covers), then it's a true phase II head.


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Old 05-05-2013, 04:27 PM   #6
PinkSTI550CC
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Looks like the ej251,
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