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Flange Nut Torque

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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Flange Nut Torque

Posted: 2/26/07 12:08pmMessage 1 of 5
b
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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 1:38pmMessage 2 of 5
S
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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--
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Flange Nut Torque

Posted: 2/26/07 2:16pmMessage 3 of 5
m
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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 
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Flange Nut Torque

Posted: 2/26/07 2:18pmMessage 4 of 5
b
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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..
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Flange Nut Torque

Posted: 2/26/07 7:15pmMessage 5 of 5
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22716
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.

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