4T80E/Turbo-S/C... TIME FOR A NEW THREAD? - Page 41 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 01-04-2008, 02:40 PM   #401
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What torque setting did you use for the head stud nuts
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Old 01-04-2008, 02:44 PM   #402
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Quote:
Originally Posted by 2000SilverBullet
What torque setting did you use for the head stud nuts
ARP calls for 80# w/moly. I used 85#.
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Old 01-04-2008, 02:45 PM   #403
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Even 85 seems low.
The head bolts on my V8 are 130 ft-lbs.
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Old 01-04-2008, 02:56 PM   #404
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Quote:
Originally Posted by 2000SilverBullet
Even 85 seems low.
The head bolts on my V8 are 130 ft-lbs.
I just got off the phone with Al at ARP, he says 80#, no more, no less. I hope I didn;t stretch the studs going to 85, can;t imagine I did since that is supposedly only 75% yield strength.

I'll go with 80, but i am using a different tq wrench to eliminate that as a possibility.
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Old 01-04-2008, 04:20 PM   #405
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Go with the manufacturers specs for sure.

The 130 ft-lb head bolts are 9/16" so yours are probably 1/2" but you can torque them to higher than 75%. They chose 75% to be safe based on torque wrench and friction variations.
Turn of the nut method is now preferred and I see even GM specs it that way in the Service Manuals. You can safely go to 85%.
Some fasteners are even torque to yield for one time use but they are made of a special metal.

You could do a simple calculation to determine turn of the nut if you knew the value of the studs yield strength and the number of threads per inch, the rest is engineering physics
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Old 01-04-2008, 04:48 PM   #406
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Quote:
Originally Posted by 2000SilverBullet
Go with the manufacturers specs for sure.

The 130 ft-lb head bolts are 9/16" so yours are probably 1/2" but you can torque them to higher than 75%. They chose 75% to be safe based on torque wrench and friction variations.
Turn of the nut method is now preferred and I see even GM specs it that way in the Service Manuals. You can safely go to 85%.
Some fasteners are even torque to yield for one time use but they are made of a special metal.

You could do a simple calculation to determine turn of the nut if you knew the value of the studs yield strength and the number of threads per inch, the rest is engineering physics
I went 85# again, in case my tq wrench wasn't quite in spec.
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Old 01-05-2008, 01:01 AM   #407
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did you get time tonight, is she back together yet?
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Old 01-24-2008, 04:25 AM   #408
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Can someone give me an update about where to get more info? It has almost been 20 days since the last post. I know this is aiming for the archives, but where can I read more about the finished head gasket repair and posted videos?
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Old 01-24-2008, 09:00 AM   #409
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He had to take a break to build my LSD. :P
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Old 01-24-2008, 09:15 AM   #410
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That is absolutely wonderful! I take it that a plethora of pictures of the work has been taken, and we'll be seeing that shortly?
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