Welcome to the North American Subaru Impreza Owners Club Tuesday November 19, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 10-15-2019, 09:36 PM   #1
20scoob04
Scooby Newbie
 
Member#: 370742
Join Date: Oct 2013
Default 2.5GT heads on EJ257 compatibly

I have a 1998 legacy 2.5 GT, I just started to get rod knock, I have an ej257 block with aftermarket pistons already installed.
Will these heads work on this block?


Sorry if this has been answered, I work on the Great Lakes on a tugboat, donít have access to a computer to do in-depth searching on the forums.
Cell phone only goes so far.
Any information is greatly appreciated.
* Registered users of the site do not see these ads.
20scoob04 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-16-2019, 03:24 AM   #2
SlammedSix
Scooby Newbie
 
Member#: 419926
Join Date: Apr 2015
Location: 06 FXT/08 STi/04 WRX/17 Outbac
Default

Yes

2 "Issues"

1- Compression will be low for NA, probably around 8.5:1

2- There is a crankcase vent off the top of the block and your coolant crossover pipe will hit it. You can modify it but its not ideal.
SlammedSix is offline   Reply With Quote
Old 10-16-2019, 03:49 AM   #3
viper_crazy
Scooby Specialist
 
Member#: 298403
Join Date: Oct 2011
Chapter/Region: W. Canada
Vehicle:
2008 WRX Premium
Spark Silver

Default

Static compression for NA should be closer to 10:1...at least what I remember from my 2011 EJ253.

EJ257 is 8.2 or 8.3. EJ255 is 8.5, iirc.
viper_crazy is offline   Reply With Quote
Old 10-16-2019, 08:53 AM   #4
20scoob04
Scooby Newbie
 
Member#: 370742
Join Date: Oct 2013
Default

Awesome, well I have intention of doing forced injection on it.
I just already had the block on the side to eventually put into it any way.
And any parts I have donít have to purchase twice is perfect

I imagine Iíll have to basically piece this motor back together?
Sti/wrx intake manifold
Fuel injector assembly
Header/UP/Exhaust setup

Edit:
On the fozzy forum some people suggest sticking with the plastic intake manifold, better with heat dissipation and such being the reasoning opposed to the wrinkle red, could I use that intake manifold thatís already on there? Wrapped in heat tape.

Last edited by 20scoob04; 10-16-2019 at 09:33 AM.
20scoob04 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 09:17 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.