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Old 08-05-2006, 08:02 PM   #1
sekretskwirl
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Default head bolt torque specs and pattern??

...putting fresh heads on my 2.5 swap today-saturday- and need the torque specs and special patterns they call for. thanks DANIELLE
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Old 08-06-2006, 05:42 AM   #2
Poweredbysnail
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Are you going to use the Stock bolts or are you going to use head studs like ARP's. Because there is a difference in the way you do them both.

Stock one you: "This is strait from the Subaru Manual"

1. Apply a coat of engine oil to washers and bolt threads.
2. Tighten all bolts to 22ft-lb in alphabetical sequence, and then tighten all bolts to 51ft-lb in alphabetical sequence.
3. Back off all bolts by 180 degrees first; back them off by 180 degrees again.
4. Tighten the bolts (A) and (B) to 25ft-lb.
5. Tighten the bolts (C), (D), (E) and (F) to 11ft-lb
6. Tighten all bolts by 80 degrees to 90 degrees in alphabetical sequence.
7. Further tighten all bolts by 80 degrees to 90 degrees in alphabetical sequence.
Caution: Ensure the total "re-tightening angle" [in the two previous steps] do not exceed 180 degrees.

This is how I did my ARP Head Studs:

1. I put thread sealer on the threads that thread into the block.
2. Thread the studs in hand tight then give them a 1/4 of a turn with an alien key.
3. Put the head on and put oil on the threads and the washers.
4. Starting at 20ft-lb torque the nuts on the head stud down in the alphabetical sequence set by Subaru then go up in torque by 20 each time until you get to 80ft-lb in the alphabetical sequence
5. Let the head sit overnight come back in the morning and retorque the nuts at 80ft-lb.

That all you have to do for the Head Studs


The alphabetical sequence.
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Old 08-06-2006, 01:07 PM   #3
sekretskwirl
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Default ARP of course,

thanks for the response-can't find it on the disc we have...a new problem now thoughne stud would not seat all the way and now....it's stuck in the block-wont' come out or back off for nothin'! To get it out is gonna rip up the threads for sure-shop says the factory never properly 'chased' the threads to begin with in the one hole..... The block is basically ruined..there is no way were goin' to put a heli-coil in 'fresh' STI BLOCK...back to dealer is goes, thanks Danielle
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Old 10-21-2007, 12:33 PM   #4
subajay
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Old 10-21-2007, 09:35 PM   #5
LiquidForce
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Quote:
Originally Posted by treefrogaz View Post
Are you going to use the Stock bolts or are you going to use head studs like ARP's. Because there is a difference in the way you do them both.

Stock one you: "This is strait from the Subaru Manual"

1. Apply a coat of engine oil to washers and bolt threads.
2. Tighten all bolts to 22ft-lb in alphabetical sequence, and then tighten all bolts to 51ft-lb in alphabetical sequence.
3. Back off all bolts by 180 degrees first; back them off by 180 degrees again.
4. Tighten the bolts (A) and (B) to 25ft-lb.
5. Tighten the bolts (C), (D), (E) and (F) to 11ft-lb
6. Tighten all bolts by 80 degrees to 90 degrees in alphabetical sequence.
7. Further tighten all bolts by 80 degrees to 90 degrees in alphabetical sequence.
Caution: Ensure the total "re-tightening angle" [in the two previous steps] do not exceed 180 degrees.

This is how I did my ARP Head Studs:

1. I put thread sealer on the threads that thread into the block.
2. Thread the studs in hand tight then give them a 1/4 of a turn with an alien key.
3. Put the head on and put oil on the threads and the washers.
4. Starting at 20ft-lb torque the nuts on the head stud down in the alphabetical sequence set by Subaru then go up in torque by 20 each time until you get to 80ft-lb in the alphabetical sequence
5. Let the head sit overnight come back in the morning and retorque the nuts at 80ft-lb.

That all you have to do for the Head Studs


The alphabetical sequence.
the specs for the stock bolts are for an 02 WRX. The newer service manuals have different specs.



I would use these directions instead.

http://65.6.129.58/public/2005FSM.pdf




Edit. I didn't realize how old this post was. I guess by now the heads are on
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Old 12-10-2013, 08:15 PM   #6
hellriderkc
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thanks,info invaluable.i can see the end in sight.
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Old 12-10-2013, 08:39 PM   #7
25rsti
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Holy bump.
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Old 03-02-2014, 10:54 PM   #8
RoyaleFoz
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El bumpo
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Old 03-02-2014, 11:37 PM   #9
Paul
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^ why would you bump this thread? Another person already did for no good reason and you saw fit to do it again?
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