Welcome to the North American Subaru Impreza Owners Club Saturday December 16, 2017
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Go Back   NASIOC > NASIOC Technical > Normally Aspirated Powertrain

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.
* Registered users of the site do not see these ads. 
Thread Tools Display Modes
Old 04-18-2001, 03:58 AM   #1
Scooby Specialist
Member#: 3069
Join Date: Nov 2000
Location: Harrison TWP Michigan USA
Question Headgaskets/Turbos and DOHCs'

Ok on my hunt to blow my 98 RS I have found that the headgaskets suck the block sucks a bit more and a few other things suck. So first I was like oh hell I will just go buy some other car to make into a tarmac terror. Than I said no I am giving up to easy. So out doing the reasearch it is suggested to get a phase II block and keep the DOHC heads. Next was the headgasket issue I have seen to many past posts with this problem so to avoid the problem I have seen people using the new gasket that is made from a different matterial?

Now a few questions...

Does the headgasket replacment consist of loosing the 98 gasket which is a cheaper material and using a 99up gasket that is stronger to pressure?

Has anyone ran copper gaskets and isn't there a negitive on using this for a street car?

Anyone know how to identify if a DOHC has a phase II block? I recently read some 98/99s came with this combo.

Thanks for your time,
* Registered users of the site do not see these ads.
MichiganRS is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-18-2001, 05:33 AM   #2
Scooby Specialist
Member#: 6
Join Date: Jun 1999
Location: South Jersey
2007 BMW Z4 M Coupe
Interlagos Blue


I don't have a straight answer for you since my MY98 is a "hybrid", using the Phase 2 block with the DOHC heads. The stock head gasket went on my car at less than 30K miles, 24K of them being boosted. The stock head gasket seemed to be pretty beefy and well made. When I had the work done, I decided to o-ring the heads and used stock head gaskets again. Hopefully this will put some extra pressure on the gaskets where needed and I won't have a problem again.

I don't know what the gaskets look like on the Phase 1 blocks.

Trey Cobb posted a thread a while back about how to identify the block type. If you look at the top of the block to the left of the oil pressure switch (located to left of the alternator), you'll see either 1 or 2 ridges extending from left to right. One ridge is a Phase 2 block, two ridges is a Phase 1 block.

SteveS is offline   Reply With Quote
Old 04-18-2001, 07:30 AM   #3
Scooby Guru
Member#: 114
Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
'03 Evo, Rice White
'01 Erion CBR 929


Trey can get copper head gaskets for you. He has a particular strategy for DOHC EJ25s depending on how much power they're making-- email them.
ColinL is offline   Reply With Quote

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
FS : Md-vf30 Turbo And Interior Parts metric Engine/Power/Exhaust 13 06-07-2010 10:26 PM
doing the headgasket replacement and have questions about the hydrolic valve lifters outback2.5 Normally Aspirated Powertrain 2 02-01-2005 12:59 AM
Headgaskets, hi and low compression Turbo GC4 Normally Aspirated with bolt-on Forced Induction Powertrain 5 04-02-2003 04:16 PM

All times are GMT -4. The time now is 10:59 PM.

Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.