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Advice on Exhaust Manifold Nuts

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Old 08-23-2008, 06:29 AM
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Default Advice on Exhaust Manifold Nuts
I've searched and all I can come up with is threads about the turbo separating, or the wastegate. What have people done to lock the manifold nuts? I know stage 8's are a good locking fastener, but they only offer bolts. Is it ok to replace the studs with bolts? I feel the threads in the head aren't really designed for that type of force, but maybe someone has better experience than me. Any advice is appreciated. Thanks.
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Old 08-23-2008, 09:21 AM
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Originally Posted by SgtB,Aug 23 2008, 06:29 AM
I've searched and all I can come up with is threads about the turbo separating, or the wastegate. What have people done to lock the manifold nuts? I know stage 8's are a good locking fastener, but they only offer bolts. Is it ok to replace the studs with bolts? I feel the threads in the head aren't really designed for that type of force, but maybe someone has better experience than me. Any advice is appreciated. Thanks.
I've been running the stage 8 bolts for a month with a lot of heat/boost and thermal cycling no problems yet.
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Old 08-23-2008, 09:34 AM
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If you have enough thread use two nuts and jam them on each other.
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Old 08-23-2008, 09:34 AM
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557? Is that all you got? Come join the 600 club. I need to send you a mani and DP
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Old 08-23-2008, 09:51 AM
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Whent with the stage 8's. I'll just drill the holes and helicoil it if it screws anything up. Thanks.
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Old 08-23-2008, 09:08 PM
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ive been using copper nuts from atpturbo.com. apparently they deform slightly when tightened which help it to stay on.
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Old 08-23-2008, 09:20 PM
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I don't like all this talk about nuts...



I'm installing my turbo soon. Hopefully my nuts will be just fine.
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Old 08-24-2008, 05:57 PM
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What about a Lock washer and loctite, mine have been fine so far.
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Old 08-24-2008, 06:02 PM
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bump for this thread,I will be turbo'ed soon so I need the info.
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Old 08-24-2008, 06:59 PM
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Originally Posted by dsddcd,Aug 24 2008, 08:57 PM
What about a Lock washer and loctite, mine have been fine so far.
That's just luck. High temp loctite only lasts to 400F, and locknuts loose their temper at manifold temps. Hopefully you'll never have my problem though.
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