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Topic: Flange Nut Torque

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Flange Nut Torque

Posted: 2/26/07 12:08pm Message 1 of 5
bytor
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Simpsonville, SC - USA
Joined: 1/21/2007
Posts: 85
Vette(s): 1978 25th. Silver Anniversary Edition 350 L-82 Stock

What the proper torque for the exhaust manifold flange nuts on a 78 w/350?




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Flange Nut Torque

Posted: 2/26/07 1:38pm Message 2 of 5
SFVette
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Posts: 380
Bytor, the Shop Manual states 20 lb-ft.

I've come across statements elsewhere that the outers should be tightened to 30 lb-ft., with the inners at 20...but the Manual doesn't list that.

Hope this helps--


Flange Nut Torque

Posted: 2/26/07 2:16pm Message 3 of 5
mkapp7879
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Joined: 10/21/2003
Posts: 1220
Is he talking about the 3 nuts that attach the exhaust pipes to the manifolds? I'd just concentrate on tightening them evenly, no tighter than 30lbs. I wouldn't even worry about torque.  Mike 


Flange Nut Torque

Posted: 2/26/07 2:18pm Message 4 of 5
bytor
Former Member
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Simpsonville, SC - USA
Joined: 1/21/2007
Posts: 85
Vette(s): 1978 25th. Silver Anniversary Edition 350 L-82 Stock
Yes, I am referring to the 3 nuts that attach the exhaust pipes to the manifolds.  Thanks for the info..


Flange Nut Torque

Posted: 2/26/07 7:15pm Message 5 of 5
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
No, no, no, you guys...the proper torque is Just BEFORE they strip out!

Jest kiddin! The above info sounds right to me. Tho it would somewhat depend on if you were using "lock-nuts" or not, too.


Joel Adams
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in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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