Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

ej25 dohc with sohc heads


  • Please log in to reply
6 replies to this topic

#1 imprezadude

imprezadude

    Newbie

  • Members
  • Pip
  • 2 posts
  • kresgeville pa

Posted 20 August 2013 - 06:35 PM

workin a 03 sohc and want to use a 99 dohc short block with the 03 sohc heads on it  any body done it  pistons apear to have a lower compression with obvious square top not sue about piston clearance and also pcv system has tube in 99 the 03 has a threaded fitting any remedys



#2 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,427 posts
  • WV

Posted 20 August 2013 - 08:18 PM

i've done it, use thick headgaskets or i believe the pistons can strike the heads. with thin headgaskets they won't strike the heads when assembled but will when running.  may vary depending how much material has/will be taken off for resurfacing.  forget which headgaskets i used but it may have simply been the 610 gaskets (last 3 digits of the Subaru part number for the DOHC heads).


PCV is easy, i don't remember having any issue with it so just use the 99 hose if the 03 fitting doesn't look to swap, which i don't remember doing. it's just hoses, compared to a short block swap that's a drop in the bucket, you'll figure that out.



#3 imprezadude

imprezadude

    Newbie

  • Members
  • Pip
  • 2 posts
  • kresgeville pa

Posted 20 August 2013 - 09:18 PM

thanks for that gaskets are what others have said  the pcv system on the 00 up are threaded in the block  the 99 down stuff the pcv is threaded into intake im gonna rigg it  



#4 nickb21

nickb21

    Subaru Fanatic!

  • Members
  • 558 posts
  • Hunterdon County

Posted 20 August 2013 - 09:34 PM

2000 (at least Legacy L's) had the pcv in the intake, not that it helps you. Isn't the intake threaded anyway with the hose nipple, maybe same threads as as the pcv?



#5 johnceggleston

johnceggleston

    Lite Master of the Subaru

  • Gold Subscribers
  • 6,473 posts
  • Virginia

Posted 21 August 2013 - 06:50 AM

the 99 block is a phase 2 block, but as mentioned, the pistons and possibly the rods are phase 1.

the crank has to match the block since they moved the thrust bearing around then.

 

i doubt they would change the thrust bearing position and the block and the crank one year just to come back a year later and change the crank again.


Edited by johnceggleston, 21 August 2013 - 06:51 AM.


#6 ivans imports

ivans imports

    1000+ Super USER!

  • Members
  • 2,954 posts
  • lumby bc canada

Posted 21 August 2013 - 10:08 AM

Must use thick headgaskets also must modify the tetioner as it will not have enuff room now i take the bracket fo it and drill the 3 holes biger so can move braket up to give more room for tentioner. Also the round pin that it sitts agiant i trim the bottom side flat by doing these two things the belt will not be to tight if not problems. Other than that i think there may be oil flow retrictions on twincam heads that are not on single cam heads this may cerate a oil preshure / flow problem. The two engines may flow oil diferently as one is end thrust and one is center. There is tiny oil retrictors in the pasage on twin cam heads



#7 johnceggleston

johnceggleston

    Lite Master of the Subaru

  • Gold Subscribers
  • 6,473 posts
  • Virginia

Posted 21 August 2013 - 01:58 PM

the ej25 block in 99 is the phase 2 block that was used 00 - 04

 

from subarugenuineparts.com the block is the same 99 - 08

                                      

Engine, Cylinder block
All Models - 2.5l, 1999-08

ENGINE »Engine

Subaru › Outback › 1999-2001

List Price : $1,104.23
Your Price : $1,037.32       


Edited by johnceggleston, 21 August 2013 - 01:59 PM.





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users