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Old 08-04-2008, 03:24 PM   #1
Scooby Specialist
Member#: 93773
Join Date: Aug 2005
Chapter/Region: RMIC
Location: Boulder, CO
1995 Flat Khaki GC8
2011 STi Wagon

Default EJ20 heads on an EJ22t block?

I've heard of this being done, but to be honest, when I searched it was all a little confusing, with people ending up arguing about whether the 2.2l was worth it/better than an EJ257.

I'm not concerned with that. I have a line on a low mileage EJ22t block and am wondering whether it's worth the trouble for me to put it in when I'm rebuilding the car.

What I need to know is what all I'll need to make this work. Treat the EJ20 motor I have as totally stock, running no reflash, no nothing, just a catback exhaust. I know I'll need head gaskets obviously, but which ones? Will the ECU adapt to the extra displacement and different compression ratio on its own, or will I need a tune? What all would getting the car to run on the 2.2l block entail?
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Old 08-04-2008, 04:05 PM   #2
Scooby Newbie
Member#: 114667
Join Date: May 2006
Chapter/Region: SWIC
Location: Peoria, AZ
00/5 Silver STi RS
FAT 40R kit w/ FMIC


If I were you I whould get the 2.2L and put it in. You would need 2.2L head gaskets to match the larger bore size of the 2.2L. And I would highly recommend a tune of some sort.... Open ECU tune. I've heard of a shop doing internet tunes with open port, you would just need the cable to do so about $100.00 online. Good luck with build..
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Old 08-04-2008, 04:13 PM   #3
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Join Date: Jul 2006
Chapter/Region: South East
Location: Greensboro, NC
2002 Impreza WRX
Midnight Black Pearl


all EJ heads are interchangable to my knowledge. Yes, you will want the 2.2L bore for the head gasket, and putting 2.0 heads on the 2.2 will probably raise the compression a bit. It might not be a bad idea to get a 1.2 or 1.3mm head gasket to drop it back down.

other than that i believe you'll be able to put the 2.0's sensors in to the 2.2 if you don't have them.
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Old 08-04-2008, 08:31 PM   #4
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Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Minneapolis, MN
1986 RX7
Sunrise Red


I am in the middle of doing this swap. If you can get an EJ257 block by all means do it because it's better. I spent a pretty penny rebuilding my EJ22 block and putting in forged pistons so in the end I don't know how much more getting an EJ257 would've been. The EJ22 has forged crank/rods to begin with so the only part that is really problematic that would need upgrading if your planning on going over 300 HP would be the pistons. Obviously the block has to be healthy to start with.

The EJ20 heads will drop your compression below 9, it's like 8.7 or something because the EJ20 has a MUCH larger combustion chamber. But if you get different pistons like I did you can fix it. I got the Wiseco's which say "-20 CC" on them. So I think I lose 13 CC from the head and gain 20 from the pistons. So in the end it is actually slightly higher compression.

The phase 1 EJ20G heads have the same sensors as the EJ22T. Just make sure that you get the metal cam gears, those are phase 1. So you can use the same cam angle sensor and everything. Just make sure you get the timing belt covers because the sensor bolts into the timing belt cover. I am having a lot of trouble getting parts for this head because it's all JDM and I can't get little pieces from the dealer.
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