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Old 11-28-2020, 01:44 PM   #1
LAS04subie
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Member#: 379520
Join Date: Jan 2014
Location: El Paso Texas
Vehicle:
2005 Wrx
WRB

Default Replace 04 Sti engine

Hello,
I recently bought an 04 Sti it came without an engine. There are plenty of parts that are missing. I was thinking of building a motor as I only have the heads. But I am missing intake manifold, Uppipe, downpipe, headers. Just recently acquired the Ecu and other small parts in missing. But I was thinking to get everything going a bit faster and get the car on the street I can buy a long block. Possibly on eBay. Does anyone know if I can use any engine? Does it have to be from an 04 or are they compatible all the way until 2020? I know itís the same engine. I just was unsure about Avcs ,drive by wire or any other possible changes over the year. Thanks in advance
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Old 11-28-2020, 04:58 PM   #2
snow_bound26
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Member#: 395793
Join Date: Jul 2014
Chapter/Region: AKIC
Location: Split time between SLC and Lak
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2005 92x Aero
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You want single AVCS and DBW. The short blocks are basically interchangeable with a few exceptions. So don't try to use a 2 liter short block with your 2.5 liter heads. Personally, since you have heads, I'd just source the parts you need and make sure the heads are refreshed properly and put it all together. Finding all the parts you need shouldn't be difficult. Check the classifieds here and in FB marketplace. These cars are so popular that finding parts is easy. Depending on your power goals, you may want to consider something other than an OEM short block. One thing you do need to consider is the turbo. Do you have the OEM turbo? Do you have any turbo yet? If not, I'd stick with an STi style and not look at anything that came off an 08+ WRX or any Legacy GT. They have a different intercooler and compressor on the turbo than the STi came with. And lastly, think about injectors and fuel rails as well. This is a good time to switch to top feed as you'll have more options and easier tuning with larger injectors down the road.
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Old 11-28-2020, 05:18 PM   #3
saaiello21
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Decent long blocks for the EJ255 are few and far between because of spun bearings taking most of them out. If you can reuse the heads you have that will be a huge cost savings because they are not cheap. You can source the block from the dealer for about $1200 no internals or 2200 with internals this will be best way to get going then to buy someones problems with a used block. I would recommend to have a machine shop deck the heads and replace valve guides and seals at the very least if reusing old heads.

If you are sourcing a long block any ej255 will work with the single AVCS you may even be able to use one with the WRX plastic manifold depending on turbo and intercooler setup you are going for. The EJ257 STI manifold engines only came single AVCS 04 to 06. You can certainly use the Dual AVCS heads but that opens up a hole new can of worms and money spent to get going rite. There are also several JDM options that will get you going for the cheapest out of all the options but be careful what company you source one from because there are a lot of bad ones out there.
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Old 11-28-2020, 07:22 PM   #4
LAS04subie
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WRB

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Quote:
Originally Posted by snow_bound26 View Post
You want single AVCS and DBW. The short blocks are basically interchangeable with a few exceptions. So don't try to use a 2 liter short block with your 2.5 liter heads. Personally, since you have heads, I'd just source the parts you need and make sure the heads are refreshed properly and put it all together. Finding all the parts you need shouldn't be difficult. Check the classifieds here and in FB marketplace. These cars are so popular that finding parts is easy. Depending on your power goals, you may want to consider something other than an OEM short block. One thing you do need to consider is the turbo. Do you have the OEM turbo? Do you have any turbo yet? If not, I'd stick with an STi style and not look at anything that came off an 08+ WRX or any Legacy GT. They have a different intercooler and compressor on the turbo than the STi came with. And lastly, think about injectors and fuel rails as well. This is a good time to switch to top feed as you'll have more options and easier tuning with larger injectors down the road.


Just depending which way I went. I donít have a turbo yet but was going to use vf39 if I bought the long block. But originally wanted to build something with an FP green. I will probably try to source the top feed as thatís a big deal. If I do build from scratch might cost me similar money as the long blocks on eBay most are ranging about 4-7k for stock internals which I find ridiculous. I would be getting id1300x I have another post with the parts Iím looking for. Thanks for all the info.
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Old 11-28-2020, 07:26 PM   #5
LAS04subie
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Member#: 379520
Join Date: Jan 2014
Location: El Paso Texas
Vehicle:
2005 Wrx
WRB

Default

Quote:
Originally Posted by saaiello21 View Post
Decent long blocks for the EJ255 are few and far between because of spun bearings taking most of them out. If you can reuse the heads you have that will be a huge cost savings because they are not cheap. You can source the block from the dealer for about $1200 no internals or 2200 with internals this will be best way to get going then to buy someones problems with a used block. I would recommend to have a machine shop deck the heads and replace valve guides and seals at the very least if reusing old heads.

If you are sourcing a long block any ej255 will work with the single AVCS you may even be able to use one with the WRX plastic manifold depending on turbo and intercooler setup you are going for. The EJ257 STI manifold engines only came single AVCS 04 to 06. You can certainly use the Dual AVCS heads but that opens up a hole new can of worms and money spent to get going rite. There are also several JDM options that will get you going for the cheapest out of all the options but be careful what company you source one from because there are a lot of bad ones out there.


Thought about going the JDM route but my tuner talked me out of it. So Iím going to stay. I think your right. Iím going to just build up. Might just order a short block and get to work.
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Old 11-29-2020, 05:44 PM   #6
BlueSTI4Me
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Go into the JDM 207 thread here and read about them. Then contact JDM motors and pickup a complete 207. You can thank me later.
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