Welcome to the North American Subaru Impreza Owners Club Sunday August 30, 2015
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Built Motor Discussion

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.
Reply
 
Thread Tools Display Modes
Old 04-10-2009, 09:35 PM   #1
cooleys04
Scooby Specialist
 
Member#: 145027
Join Date: Apr 2007
Chapter/Region: SWIC
Location: phoenix
Vehicle:
2004 WRX FP Green
MFactory/2Tone/built 205

Default OEM head gasket vs. Aftermarket

I've done some research and can't find any decent information on what difference (if any) exists between the factory hg and aftermarket hg's as far as ability to hold boost. I'm building an ej20 with 8.5:1 cp pistons, eagle rods, acl, etc. My plans are to eventually run a turbo comparable to a fp red @ 20-25psi. I'm going to be buying an OEM full gasket set and am wondering whether I really need to buy a set of cometics when I'll already have a set of OEM hg's. Any input?
* Registered users of the site do not see these ads.
cooleys04 is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 04-10-2009, 09:54 PM   #2
john 1badSTI
Scooby Specialist
 
Member#: 77470
Join Date: Dec 2004
Chapter/Region: MWSOC
Location: grove city ohio
Vehicle:
04 sti 10.51@138.5
on e85@ 30psi--spinning

Default

I prefer to run the subaru head gskts whenever possible unless I need a thicker gskt then I will use a cometic and its usually with a sleeved and o-ringed set-up.I have personally seen the stock hd gskts hold 35 psi no problem but that was with ARP studs of course.
john 1badSTI is offline   Reply With Quote
Old 04-12-2009, 11:42 AM   #3
Fongers
Scooby Specialist
 
Member#: 118239
Join Date: Jun 2006
Chapter/Region: SCIC
Location: Beijing and Venice Beach
Vehicle:
2002 Built Wagon
Wife- 2004 Outback SE

Default

^ agreed. I have cometics but that was only to bump down compression
Fongers is offline   Reply With Quote
Old 04-12-2009, 12:39 PM   #4
wrxwhat
Scooby Specialist
 
Member#: 87653
Join Date: May 2005
Chapter/Region: South East
Location: Orlando, FL
Vehicle:
500 hp STI / 1100hp
Supra T / Stock G35

Default

Stock headgaskets with ARP studs work better in 99% of the Subaru applications out there.
wrxwhat is offline   Reply With Quote
Old 04-12-2009, 10:52 PM   #5
cooleys04
Scooby Specialist
 
Member#: 145027
Join Date: Apr 2007
Chapter/Region: SWIC
Location: phoenix
Vehicle:
2004 WRX FP Green
MFactory/2Tone/built 205

Default

Awesome, thats what I was hoping to hear. Thanks guys.
cooleys04 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Tuning shops still recommend OEM head gaskets. Max Umbarger Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) 33 06-22-2009 01:55 AM
subaru updated 4 layer head gasket vs. all others madmax718 Service & Maintenance 2 01-06-2009 06:03 PM
Socal: Brand New STI oem head gasket set methaddict Engine/Power/Exhaust 2 10-11-2008 03:51 PM
Brand New STI 100mm oem head gasket set methaddict SCIC Private Classifieds 1 10-11-2008 03:50 PM
Old head gaskets vs new 4 layer ones White2.5GT Normally Aspirated Powertrain 10 03-25-2004 06:54 AM


All times are GMT -4. The time now is 04:58 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2015 Axivo Inc.
Copyright ©1999 - 2015, North American Subaru Impreza Owners Club, Inc.