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Old 04-14-2008, 04:02 PM   #1
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Header bolt torque

After finally removing the stock headers, and only breaking one header bolt i am ready ti install Schnell headers. What is the torque for the header bolts on a MY 99 base 2.5? thanks
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Old 04-14-2008, 06:17 PM   #2
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Broken Header Bolt

How did you finally get the broken bolt out? I am putting used engine this week and it has 1 broken bolt- I have not tried to get it out yet!

Did not see a torque spec for the header bolts- I will talk to a couple og buddies tomorrow.
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Old 04-14-2008, 09:41 PM   #3
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Sounds like you're having a good time.

Headers / manifold end:
19 ft lbs for each of the 6 bolts / studs.

Flange end:
22 ft lbs for each of the 3 bolts / studs.

Here's a good read if you're interested:
Header installation - Need Help!

Enjoy! Show some pics or sound bytes when you're done!
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Old 04-14-2008, 10:02 PM   #4
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From the Factory Repair Manual - The Exhaust Manifold to Cylinder Head Bolt (M8 X 28) torque spec is: 23 Nm or 17 Ft.Lbs. Note: The Repair Manual also states to always renew the bolts and metal seals.
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Last edited by Lil bastard; 04-14-2008 at 10:05 PM.
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Old 04-15-2008, 07:21 AM   #5
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header bolt torque

Thanks for the replies. the bolt that i snapped was already on its' way out when it broke, so I just applied a vice-grip to it.
I ordered new bolts and waiting for their arrival. I didn't want to take a chance having one break off on the way in, so for peace of mind i am spending 1.44 per bolt.
getting the stock headers off was not as bad as I expected, I did have to hacksaw that top bolt on the pipe that goes to the cat though, that was the biggest obstacle. Otherwise all the bolts did not not need much persuasion.
Seeing that the Schnell headers are quite larger than the stock headers, i'm thinking that I might have to back off on the muffler to get the headers in.
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Old 04-15-2008, 11:51 AM   #6
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Hey JBB,

Glad to hear you worked it out.

Not sure what you mean by "back off on the muffler to get the headers in"??

I can think of two things to give you more room---one would be to take off the support brace on either side (re: if you haven't done that already) and the other would be to put the flange side in first and have it butt up against the cat end, then give it a little umph to get the manifold end in. (re: is this was what you mean??)

Anyway, looks like you're almost there!
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Old 04-15-2008, 05:27 PM   #7
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header bolt torque

I was just checking out hte clearance of the new headers, and the bolts that go from the cats to the headers are studs or welded in, if these bolts were removable i think the header would just fit fight in. i didn't play around with it too much, I was thinking if i loosened the muffler brackets I would gain some additional room to manaveur the header in. Any way i'm having fun and thinking about the money i am about to save by doin myself.
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Old 04-15-2008, 05:27 PM
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