C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Torque Specifications

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Old Jan 1, 2009 | 02:13 PM
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Default Torque Specifications

I have the Factory Service Manual and a Haynes manual for my 1985. I have not been able to find the torque specifications and I have found the torque specifications for the intake manifold to the head and the TB to the plenum. I can't find the torque specifications for the runners to the to the plenum or manifold. Help would be appreciated. If they can be found in the FSM please let me know what page.

Thanks
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Old Jan 1, 2009 | 02:20 PM
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According to my '90 FSM:

Intake manifold runner bolt..........................34Nm (25 lbs.ft.)
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Old Jan 1, 2009 | 02:54 PM
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Mine says 18 ft lbs.
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Old Jan 1, 2009 | 07:11 PM
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Demonic 85, I see you have an 85 also, can you tell me what page in the FSM lists the torque specification for the runners?
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Old Jan 1, 2009 | 09:21 PM
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Can anyone confirm correct torque 1985 TPI Runners?
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Old Jan 2, 2009 | 10:09 AM
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25 lbs
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Old Jan 2, 2009 | 11:13 AM
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Pic from '90 FSM:
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Old Jan 2, 2009 | 03:00 PM
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Thanks for the information. I will recheck my FSM to the page you show. I will use 25 pound feet if I cant find a similar page in my 1985 FSM.
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Old Jan 4, 2009 | 07:19 AM
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In my manual, it's on page/section 6A1-37.
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Old Feb 10, 2009 | 04:12 PM
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Default Torque Spec question

The torque specifications in the manual..Are they meant for dry or lightly oiled fasteners? I usually hate putting a dry fastener on and also always use never-seize . I am sure this affects the torque valves, but in a quantifiable manner? . Any mechanic or engineer want to weigh in on this please?
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Old Feb 10, 2009 | 04:16 PM
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I use German torque on mine....."goodentight"

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Old Feb 10, 2009 | 04:19 PM
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I'm pretty sure those are dry values. And yes, oil/anti-seize/any liquid will change torque values. If you really want to use anti-seize, bump up the torque a few ft-lbs and call it a day; IIRC, the difference is maybe 10-20%.
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Old Feb 10, 2009 | 06:58 PM
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Originally Posted by engle1147
I use German torque on mine....."goodentight"

That's the spec I use too.
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Old Feb 11, 2009 | 01:51 PM
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Originally Posted by StealthLT4
I'm pretty sure those are dry values. And yes, oil/anti-seize/any liquid will change torque values. If you really want to use anti-seize, bump up the torque a few ft-lbs and call it a day; IIRC, the difference is maybe 10-20%.
Sorry but this is wrong information. The correct torque on a fastener is determined by bolt stretch. The bolt stretch figures are then interpreted to torque readings (foot-pounds or newton-meters). If oil, assembly lube, antiseize or whatever is used on a bolt, it will cause a LOWER torque reading for the same bolt stretch. If these lubricants are used, the torque value must be adjusted DOWNWARD to avoid overtorquing the fastener and possible pulling threads or breaking bolts.
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Old Feb 11, 2009 | 02:31 PM
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Originally Posted by 383vett
Sorry but this is wrong information. The correct torque on a fastener is determined by bolt stretch. The bolt stretch figures are then interpreted to torque readings (foot-pounds or newton-meters). If oil, assembly lube, antiseize or whatever is used on a bolt, it will cause a LOWER torque reading for the same bolt stretch. If these lubricants are used, the torque value must be adjusted DOWNWARD to avoid overtorquing the fastener and possible pulling threads or breaking bolts.


Originally Posted by engle1147
I use German torque on mine....."goodentight"

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