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 2Likes
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1
Post By jhv48
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1
Post By Mattsvtcobra
06-07-2020, 02:56 PM
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CC Member
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Join Date: Sep 2013
Location: Sparta,
nj
Cobra Make, Engine: Backdraft 1048
Posts: 270
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Valve cover torque spec
Does anyone know the valve cover torque spec for Rousch 427
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Gary
Backdraft 1048
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06-07-2020, 04:00 PM
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Join Date: Nov 2014
Location: LaMarque,
TX
Cobra Make, Engine: BDR, Roush 402R
Posts: 160
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If you are using the cobra 427 Roush covers (Thick)I torque to 7ft# with no issues
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06-17-2020, 03:50 PM
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Join Date: Feb 2010
Location: Honolulu HI, East Haddam, CT, Middletown,
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Cobra Make, Engine: BDR #656 402 SR TW
Posts: 179
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My bolts were too long on optional Roush valve covers. Shortened them and no more leakage. 7lbs sounds about right
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06-18-2020, 09:11 AM
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Join Date: Aug 2007
Location: Carlsbad,
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Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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I just kept tightening them until they stopped leaking.
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Jim
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06-18-2020, 11:18 AM
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Cobra Make, Engine: Hi-Tech
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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...
Last edited by Mongoose930; 06-18-2020 at 01:17 PM..
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06-19-2020, 06:10 AM
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Quote:
Originally Posted by BDR0572
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
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Gary
Backdraft 1048
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06-20-2020, 12:42 PM
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Join Date: Mar 2006
Location: San Marcos california,
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Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
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Honestly...if you have to ask this,you should not touch a wrench.
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06-20-2020, 06:21 PM
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Cobra Make, Engine: Backdraft #360
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Quote:
Originally Posted by CHANMADD
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? |
06-21-2020, 10:16 PM
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Join Date: Feb 2006
Location: Thousand Oaks,
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Cobra Make, Engine: Classic Roadster
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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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06-22-2020, 06:01 AM
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Join Date: Sep 2013
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Thanks all, that’s what a forum is all about a conglomerate of experience
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Gary
Backdraft 1048
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06-22-2020, 11:11 AM
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Join Date: May 2006
Location: St. Louisville,
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Cobra Make, Engine: A&C 67 427 cobra SB
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Quote:
Originally Posted by Mongoose930
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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