Eg207 heads with 257 block
Results 1 to 8 of 8

This is a discussion on Eg207 heads with 257 block within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; What problems I'll have with using Wrx heads on a nitrate crank 257 block? It's in a Wrx 02 bugeye ...

  1. #1
    Registered User
    Join Date
    Oct 2013
    Posts
    15

    Eg207 heads with 257 block

    What problems I'll have with using Wrx heads on a nitrate crank 257 block? It's in a Wrx 02 bugeye

    Sent from my GT-P3110 using Tapatalk

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #2
    Moderator Donkey's Avatar
    Join Date
    Apr 2005
    Location
    Da boonies
    Posts
    6,041
    I Support ClubWRX
    Using JDM EJ207 heads will change the compression ratio.
    Resident Adviser @ WTF Tuning, LLC
    2002 FORESTER S
    1998 FORESTER S




  4. #3
    Registered User
    Join Date
    Oct 2013
    Posts
    15
    Compression ratio will be changed. Cosmetic gasket. Arp studs.

    Problems?

    Sent from my GT-P3110 using Tapatalk

  5. #4
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,015
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by soundboy View Post
    Compression ratio will be changed. Cosmetic gasket. Arp studs.

    Problems?

    That can work. The general consensus is you'd be better off having the combustion chambers worked over to lower compression rather than running a thick gasket. The detonation threshold would be lower, and the OEM gasket seals better.

  6. #5
    Registered User
    Join Date
    Oct 2013
    Posts
    15
    How's the Best way to lower it?
    Different pistons?

    Sent from my GT-P3110 using Tapatalk

  7. #6
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,015
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by soundboy View Post
    How's the Best way to lower it?
    Different pistons?

    Opening up the the combustion chambers, in the heads. Either have them cc matched to the 2.5L heads, or at least have edges taken off where they will have a tendency to hot spot.. if you're wanting to run higher compression.

    What kind of fuel do you plan on using?

  8. #7
    Registered User
    Join Date
    Oct 2013
    Posts
    15
    Port and polish then?

    92 or 95 octain.
    I'm not in the us.
    I have access to wstermeth. Planning on using the aem v2 kit

    Sent from my GT-P3110 using Tapatalk

  9. #8
    zax
    zax is online now
    \_(ツ)_/ zax's Avatar
    Join Date
    Nov 2008
    Location
    Neverland Ranch, Maryland
    Posts
    12,827
    I Support ClubWRX I Support ClubWRX
    You'd be better off working a set of EJ257 heads
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly unimaginably stock 2015 STi build thread
    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

    Zach | Moderator -- Mid-Atlantic States, Tech & Modifying & General Repairs
    Rollin' with the Bugeye Mafia #302 | N.E.R.D. Subject Zero
    Facebook me here

    Your Mid-A local board: http://www.clubwrx.net/forums/mid-atlantic-states/

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •