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05-11-2022, 06:08 PM | #1 |
Scooby Newbie
Member#: 524025
Join Date: Apr 2021
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EJ20 vs EJ25 heads
currently putting a ej20 in my car as a temporary solution until i can get a iag shortblock. Later down the road am I able to put the heads from the EJ20 on a EJ25 built shortblock? not sure if theyre plug and play for each other or not. thank you
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05-11-2022, 06:27 PM | #2 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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Not really, you can open the chamber, but then ej20 heads have their own issues
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05-11-2022, 06:46 PM | #3 |
Scooby Specialist
Member#: 495950
Join Date: Jan 2019
Chapter/Region:
South East
Location: Augusta, GA
Vehicle:2011 WRX WRB |
where are the heads from the old motor that your taking out?
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05-11-2022, 09:51 PM | #4 |
Scooby Newbie
Member#: 517987
Join Date: Aug 2020
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depending on the heads you can change your compression rate and be dealing with bunch of issues. Stick on OEM, you will not gain anything from 205 heads unless they are from 207
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05-12-2022, 07:12 AM | #5 |
Big Ron
Super Moderator Member#: 18062
Join Date: Apr 2002
Chapter/Region:
MAIC
Location: I can save you a ton of cash
Vehicle:on car parts so PM me b4 j00 buy |
Its not a plug and play issue, Subarus are like Legos, everything will plug....its the play that is often not apparent.
2.0 heads on a 2.5 is known as a hybrid and is a thing. Here are the ways to do it: 1. Have your 2.0 heads machined to the correct compression ratio. Expensive. 2. Get JE FSR hybrid pistons when, due to their design, are the correct compression ration with 2.0 heads. Easy. 3. Stack some head gaskets to get close to the compression ratio. As good of an idea as invading Russia in winter. I chose option 2. I make 2.5 power. I get 2.0 gas mileage. |
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