| genolan |
06-07-2020 02:56 PM |
Valve cover torque spec
Does anyone know the valve cover torque spec for Rousch 427
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| BDR0572 |
06-07-2020 04:00 PM |
If you are using the cobra 427 Roush covers (Thick)I torque to 7ft# with no issues
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| pjmoore2003 |
06-17-2020 03:50 PM |
My bolts were too long on optional Roush valve covers. Shortened them and no more leakage. 7lbs sounds about right
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| jhv48 |
06-18-2020 09:11 AM |
I just kept tightening them until they stopped leaking.
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| Mongoose930 |
06-18-2020 11:18 AM |
Is it safe to assume that all Rousch heads are aluminum? I believe the head material would have more to do with the torque spec. than anything else. As a teenager, I remember carefully researching the recommended torque spec. for the valve covers on my Mopar 440 only to strip a few bolts as I was using ft lbs and not in lbs. That is one mistake I will never make again...
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| genolan |
06-19-2020 06:10 AM |
Quote:
Originally Posted by BDR0572
(Post 1478050)
If you are using the cobra 427 Roush covers (Thick)I torque to 7ft# with no issues
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I tightened them to 7 ft/lbs or 84 in/lbs and all leaked stopped
Thanks |
| CHANMADD |
06-20-2020 12:42 PM |
Honestly...if you have to ask this,you should not touch a wrench.
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| Mattsvtcobra |
06-20-2020 06:21 PM |
Quote:
Originally Posted by CHANMADD
(Post 1478654)
Honestly...if you have to ask this, you should not touch a wrench.
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Why is that? Because he knows any and all info for an engine? A lot of Backdrafts have Roush engines, but I know you already knew that. So what's the torque spec cowboy? |
| MaSnaka |
06-21-2020 10:16 PM |
genolan,
ask ask ask questions. That is what the forum is for. I have asked so many questions and gotten so many answers that helped me learn a ton. Still asking and still learning btw. I'm a hack. I tighten until snug tight. Not over and not loose but snug... No leaks. Aluminum heads and aluminum covers.
John
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| genolan |
06-22-2020 06:01 AM |
Thanks all, that’s what a forum is all about a conglomerate of experience
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| olddog |
06-22-2020 11:11 AM |
Quote:
Originally Posted by Mongoose930
(Post 1478592)
I believe the head material would have more to do with the torque spec. than anything else.
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This is not correct. The torque is based on the friction to turn the bolt and the desired tension on the bolt. That is why they list dry and lubricated torque specs.
Here is where the aluminum comes into play. For steel and cast iron the length of threads that are needed is about one bolt diameter. For aluminum you need two bolt diameters. So a 1/4" diameter bolt needs to have a minimum of 1/4" of threads into the hole in a cast iron head. The same bolt in an aluminum head would need 1/2" of threads. Now there are modifications done to reduce the number of threads needed. If they tap the hole bigger and put in a heli-coil or other type of insert, you do not need as many threads. Depending on the outer diameter of the insert, it is possible to get back to one bolt diameter. |
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