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GMC V6 and V12 Engines Engine repair and rebuilding

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  #1  
Old November 25th, 2015, 10:44 PM
makindust makindust is offline
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Default Intake Manifold Torque spec

Can anyone tell me what to torque the bolts to for an Intake Manifold on a 351 V6. I have to replace the gaskets and I am struggling trying to find proper torque information.
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Old December 2nd, 2015, 04:03 AM
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Default Re: Intake Manifold Torque spec

I'll look in the manual tomorrow morning and let you know if I find anything. It's 29 degrees right now so no way I can get outside. If I don't find any specs, I'm sure you'd be OK with German torque specs...You know, "GutenTight".

Maybe someone else will pipe up. I know alot of the old timers have done gaskets.
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Old December 2nd, 2015, 11:17 AM
George Bongert George Bongert is offline
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Default Re: Intake Manifold Torque spec

Greetings, makindust!

I'm pretty sure that the intake manifold bolts would be Grade five 3/8-16 NC bolts. This type of fastener is usually torqued to 35 foot pounds, although different applications call for different torque specs. If you go to Fastenal, I am quite sure they would be able to provide you with a bolt torque specification chart. Hope this helps.
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Old December 2nd, 2015, 06:02 PM
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Default Re: Intake Manifold Torque spec

I just tightened mine down snugly. lol Bout 25-30 foot pounds I think is common.
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Old December 3rd, 2015, 02:26 AM
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Default Re: Intake Manifold Torque spec

thanks for the input, I just didn't want to get carried away and over torque and crack the manifold. I would probably have a hard time finding a replacement. Thanks
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Old December 3rd, 2015, 08:06 PM
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Default Re: Intake Manifold Torque spec

Motor's Truck Repair Manual Engine Tightening Specs.
list 20-25 ft. Lbs. for V6-351 Intake Manifold
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Old December 3rd, 2015, 08:35 PM
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Default Re: Intake Manifold Torque spec

Quote:
Originally Posted by Nate View Post
Motor's Truck Repair Manual Engine Tightening Specs.
list 20-25 ft. Lbs. for V6-351 Intake Manifold
Nate beat me to it! According to my manual this is correct for all the V6's too. Rocker arms should be 20-25 Ft lbs too while I'm reading it here. Cyl heads are 65-72 ft lbs.

And dont forget to test your torque wrench before getting started either. Ask me how I know about that.

P.S. Sorry for the slow reply. Big day yesterday.
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Old December 5th, 2015, 05:08 AM
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Default Re: Intake Manifold Torque spec

Thanks, no problem about the dslay in response. I wasn't able to get outside to work on my truck until this evening.
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