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Guest Message by DevFuse
 

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2006 Legacy 2.51 Better Head Gasket - Subaru or Six Star

SOHC 2.5 head gasket head gasket

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11 replies to this topic

#1 06SubLegTx

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Posted 10 May 2017 - 07:36 PM

I know this has been asked before.

 

What's the better Head Gasket?  Why?


Edited by 06SubLegTx, 10 May 2017 - 09:20 PM.


#2 Svengouli7

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Posted 13 May 2017 - 04:25 PM

All I know is I've replaced both.

#3 06SubLegTx

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Posted 14 May 2017 - 05:30 AM

All I know is I've replaced both.

Can you tell which lasted longer?  How many miles did you put on each different set?



#4 idosubaru

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Posted 14 May 2017 - 07:47 AM

what about the other important aspects of this job:
1. resurfacing the heads
2. resurfacing the block

Open questions like this are usually limited in scope. The best qualified people don't usually respond. So you'll get anecdotal low grade replies.

Ideally you get info from GD, GLoyale, Crawlerdan and people that have replaced significant numbers. Ivansimports as well. But they'd have to quit their jobs to reply to every common question so they don't respond much here.

Ideally you do some significant searching and post links or specific questions.

It would be nice to curate a thread comprising all of the high capacity folks comments on the subject.

I've owned 40 Subarus, worked on many more and have no clue how many headgaskets I've replaced - and still my experience regarding your question is anecdotal and not technically worth a lick. By reading replies you'll just get a bunch of statistically meaningless opinions and experiences like mine.

If you search, I know some of those guys have reported before what they use and have seen. It's worth finding what they've said. Use google search and find their usernames from USMB.

I'm comfortable using Subaru or Fel Pro based on the comments of really experienced people who have come to their own conclusions.

I'm pretty sure crawlerdan has used Fel Pro for years hundreds of times without issues over many years. He's got a statistically significant look at long term success and enormous same size a thread like this will never touch.

#5 GeneralDisorder

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Posted 14 May 2017 - 09:59 PM

Subaru - 06+ 2.5 turbo gasket. Part number ending in 770. 

 

GD



#6 06SubLegTx

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Posted 15 May 2017 - 04:43 AM

Subaru - 06+ 2.5 turbo gasket. Part number ending in 770. 

 

GD

Thoughts on Six Star?



#7 DaveT

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Posted 15 May 2017 - 06:21 AM

Never heard of 6 star.
For these engines. I would go by what GD wrote. I have not had to do one of these newer engines yet. I have done a few older ones, and used Fel pro, which is the only brand I have seen recommended other than oem.

#8 ferret

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Posted 15 May 2017 - 06:48 AM

Not in the 10's or hundreds of these, but I have done at least a dozen or more of EJ25's, and I agree with Grossgary.

 

I have used both Subaru gaskets and Felpro, and none have come back.

 

Preparation is the key to a successful job. Each time I get the heads resurfaced, and scrub down the mating block surface with a 3M Scotchbrite pad, or 2 or 3 using kerosene as a solvent. I scrub until the block surface is completely clean of any old gasket or  debris.

 

Next is to follow the proper torque sequence and specs for the engine.

 

I have yet to replace head bolts, but you will probably get various answers on this also.



#9 GeneralDisorder

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Posted 17 May 2017 - 01:51 AM

Six Star are just rebranded Cometic gaskets with a premium price. Nothing special about them. We occasionally use Cometics when we need a custom thickness (which is very seldom). No real complaints but honestly the 770 gaskets are as good or better than anything the aftermarket has to offer and they are cheap and readily available at any dealer. Pretty much always in stock. Made by Nippon Rienz. 

 

GD


Edited by GeneralDisorder, 17 May 2017 - 01:53 AM.


#10 Mike104

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Posted 24 May 2017 - 01:09 AM

I'm in the middle of a 2.5L to 2.0L swap and the 2.0L JDM engine uses a 482 (superseded by 483) head gasket.  Main difference from the 770 gasket is the cooling cutouts on the 770 are smaller.  I don't know the significance of that change so decided to use the 11044AA483 from the Subaru Dealer (get cost + 10% as son is employee).



#11 GeneralDisorder

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Posted 25 May 2017 - 09:59 AM

There is no significance to the cooling passage alignment. The factory uses gaskets that partially or completely block passages all the time. I have NEVER seen an issue due to gasket/head cooling passage mismatch. If it's for an EJ engine, has the right bore diameter, and the thickness you are looking for then you are OK to run it.

GD

Edited by GeneralDisorder, 25 May 2017 - 10:01 AM.


#12 Mike104

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Posted 27 May 2017 - 12:49 AM

Thanks for the input GD, as I didn't know the significance of the cooling passage size, I stuck with what was in there.  the 483 gasket is also an MLS one like the 770


Edited by Mike104, 27 May 2017 - 12:52 AM.






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