Sti heagaskets on N/A EJ25 torque specs?

petrakov08 · 07-10-2012, 08:36 PM

I'm putting together a 2.5 phase II block with phase I heads, from the research I've done 04-05 Sti headgaskets can be used for higher compression. What torque specs should I use since the gaskets are thinner and I'm putting DOHC heads on a SOHC block?

Thanks

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alt14 · 07-11-2012, 12:28 AM

I'd go with the specs from the block itself otherwise you might over tighten them

geronimo81 · 07-13-2012, 08:20 PM

Torque sequence/spec needs to match the heads. I hope this helps. Also need the DOHC head bolts as they are longer.

petrakov08 · 07-16-2012, 08:38 PM

Anyone else have an opinion? Am I matching block or head torque specs?

jamal · 07-16-2012, 09:23 PM

Heads. Same sequence for all DOHC cars. You may want to double check piston to head and piston to valve clearances with the thinner HGs though. I was under the impression you have to use the thicker phase 1 gaskets.

petrakov08 · 07-17-2012, 03:22 PM

Gotcha, the sequence in which you tighten the head bolts is the same but what about the actual torque specs on each bolt? Does anyone have any opinion on the valve clearance? From what I've read there aren't issues with the thinner gaskets.

AliBenn · 07-17-2012, 04:09 PM

my thread:

http://forums.nasioc.com/forums/show...ght=headgasket

no issues with valve clearance

petrakov08 · 07-24-2012, 09:14 PM

Quote:

Originally Posted by AliBenn

my thread:

http://forums.nasioc.com/forums/show...ght=headgasket

no issues with valve clearance

Thank you.

Can anyone confirm the torque specs I've found?

(That's DOHC heads on a SOHC block with EJ257 Sti Gaskets)

...
Torque to 22ftlbs
Then to 51
Loosen 180*
Loosen 180*
Torque 1-2 to 25
3-6 to 11
Tighten 80-90*
Tighten 80-90*

07-10-2012, 08:36 PM	#1
petrakov08 Scooby Newbie Member#: 217146 Join Date: Jul 2009 Location: MN Vehicle: 1998 Impreza RS Black	Sti heagaskets on N/A EJ25 torque specs? I'm putting together a 2.5 phase II block with phase I heads, from the research I've done 04-05 Sti headgaskets can be used for higher compression. What torque specs should I use since the gaskets are thinner and I'm putting DOHC heads on a SOHC block? Thanks * Registered users of the site do not see these ads.

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07-11-2012, 12:28 AM	#2
alt14 Scooby Specialist Member#: 271928 Join Date: Jan 2011 Chapter/Region: Tri-State Location: Gettysburg PA Vehicle: 2007 Impreza 2.5i SE OBP	I'd go with the specs from the block itself otherwise you might over tighten them

07-13-2012, 08:20 PM	#3
geronimo81 Scooby Newbie Member#: 154586 Join Date: Jul 2007 Chapter/Region: BAIC Location: San Ramon Vehicle: 1996 ej22 Outback White	Torque sequence/spec needs to match the heads. I hope this helps. Also need the DOHC head bolts as they are longer.

07-16-2012, 08:38 PM	#4
petrakov08 Scooby Newbie Member#: 217146 Join Date: Jul 2009 Location: MN Vehicle: 1998 Impreza RS Black	Anyone else have an opinion? Am I matching block or head torque specs?

07-16-2012, 09:23 PM	#5
jamal Scooby Guru Member#: 71875 Join Date: Oct 2004 Location: Montana Vehicle: 98 2.5GT my wheels fit	Heads. Same sequence for all DOHC cars. You may want to double check piston to head and piston to valve clearances with the thinner HGs though. I was under the impression you have to use the thicker phase 1 gaskets.

07-17-2012, 03:22 PM	#6
petrakov08 Scooby Newbie Member#: 217146 Join Date: Jul 2009 Location: MN Vehicle: 1998 Impreza RS Black	Gotcha, the sequence in which you tighten the head bolts is the same but what about the actual torque specs on each bolt? Does anyone have any opinion on the valve clearance? From what I've read there aren't issues with the thinner gaskets.

07-17-2012, 04:09 PM	#7
AliBenn NASIOC Supporter Member#: 487 Join Date: Nov 1999 Chapter/Region: TXIC Location: Greatwood/Sgrlnd Vehicle: 1998 /2005 STunIcorn Acadia Green RS-T	my thread: http://forums.nasioc.com/forums/show...ght=headgasket no issues with valve clearance