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95 Legacy EJ22 5MT, 98 Legacy EJ22 5MT, 99 Legacy Outback EJ25 4EAT "Agent 99", 01 Forester EJ25 4EAT
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Discussion Starter #1 (Edited)
EJ25S head gasket re-use?

I'm juggling pieces of two motors - one with a rod through the block, the other with a broken valve - to make one. The good block was recently rebuilt by PO using Fel-Pro Permatorque MLS head gaskets, part # 26415PT. As I swap over a head from the busted block, it'd be great if I could re-use this Fel-Pro gasket. What say you all?

WHOOPS! That should have read EJ25S ! (Though I don't think it actually makes any difference - same short block, so same gasket.)
 
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1999 Legacy Outback, 2008 Outback
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being that i just paid about $400 to my mechanic for a gasket and bolt kit, i'd think if they look good go for it!
 

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They are like $60 a pair from Summit Racing. I would replace them. Once a head gasket has been torqued down it is hard to find a good reason to reuse it.
 
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2008 OB Limited 2.5i, Portland OR USA
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I agree with @z28dug. This is a risk / reward tradeoff, and we know both risk and reward - rebuilding the engine a second (third?) time, versus $60.

I can't think of a single other part that I'd be less inclined to re-use than a head gasket. OK, one - oil filter.
 

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95 Legacy EJ22 5MT, 98 Legacy EJ22 5MT, 99 Legacy Outback EJ25 4EAT "Agent 99", 01 Forester EJ25 4EAT
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Discussion Starter #5
The Fel-Pro techs strongly discouraged its re-use as well (and yes, I get that they're in the business of selling gaskets, but in my experience applications support guys tend to be straight-shooters). Amazon's price for this gasket is half what NAPA wants here in town, so I've got one on order. My compromise is re-using the head bolts from the busted-block engine, which - as far as I can tell - hasn't been touched since the factory.
 
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'03 outback limited, '01 Outback Limited, '01 Legacy L wagon, '96 Legacy Brighton wagon
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Involatile rule about head gaskets - NEVER reuse them! Especially if you don't want to have to replace them again shortly in the future.
 

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95 Legacy EJ22 5MT, 98 Legacy EJ22 5MT, 99 Legacy Outback EJ25 4EAT "Agent 99", 01 Forester EJ25 4EAT
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Discussion Starter #7
Inviolate?
 

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OBW H6 VDC, Tribeca, XT6
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yes, replace.
My compromise is re-using the head bolts from the busted-block engine,
there's no reason to replace the headbolts so there's no worries there. Subaru doesn't say to replace them, there's no need, and most dealers/Subaru shops are not replacing them.

they can be annoying to clean, so that's the one benefit of replacing them, otherwise it's benign.
 

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1999 Legacy Outback, 2008 Outback
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yes, replace.
there's no reason to replace the headbolts so there's no worries there. Subaru doesn't say to replace them, there's no need, and most dealers/Subaru shops are not replacing them.

they can be annoying to clean, so that's the one benefit of replacing them, otherwise it's benign.
my mechanic who worked for years at a Subaru dealership and has had his own shop for 15 years
says he has never had a HG job come back because he 1) used turbo gaskets even on non-turbo 2) uses
new bolts and 3) resurfaces the heads.
here is something i found on "enginebuildermag.com";
"If you end up replacing the head gasket, don’t reuse the original head bolts because they are torque-to-yield (TTY) bolts. TTY head bolts stretch when tightened and should not be reused because they may break or fail to maintain torque." sounds logical to me. i just spent a small fortune getting the HG done on my 1999 OB and i am pretty confident (hopeful) that i will get another 100,000 miles out of her ;)
jim
 
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