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Generation III External Engine
LS1 | LS6 | Bolt-Ons | Intakes | Exhaust | Ignition | Accessories
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Old 01-07-2011, 06:22 PM   #1
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Default fast intake bolt torque spec

im doing some cleanup under the hood im gunna take the intake bolts off and paint em does anyone no the torque specs for them?
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Old 01-07-2011, 07:28 PM   #2
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Same as stock - see attached.
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File Type: pdf Intake.pdf (23.3 KB, 603 views)
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Old 01-08-2011, 05:15 PM   #3
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Do not torque to stock specs!!! Check with FAST. If I remember correctly they are saying to tighten only to where the gaskets are Crushed.. I have seen these Manifolds Crack if you tighten to stock Tq specs.. I usually only go to around 74 # in. Make sure you use the proper Tq sequence.
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Old 01-08-2011, 05:22 PM   #4
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Quote:
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Do not torque to stock specs!!! Check with FAST. If I remember correctly they are saying to tighten only to where the gaskets are Crushed.. I have seen these Manifolds Crack if you tighten to stock Tq specs.. I usually only go to around 74 # in. Make sure you use the proper Tq sequence.
thanks for the info how many foot pounds?
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Old 01-08-2011, 05:34 PM   #5
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89in/Ibs maximum is what my FAST 92mm install manual says. you do one pass with 45in/Ibs then the final pass to 89. and there is a Tq sequence as well but i dont have a pdf of this.

camera phone to the rescue:

Click the image to open in full size.

Last edited by cookba; 01-08-2011 at 05:48 PM..
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Old 01-08-2011, 05:48 PM   #6
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Quote:
Originally Posted by 99LSS1 View Post
Do not torque to stock specs!!! Check with FAST. If I remember correctly they are saying to tighten only to where the gaskets are Crushed.. I have seen these Manifolds Crack if you tighten to stock Tq specs.. I usually only go to around 74 # in. Make sure you use the proper Tq sequence.
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thanks for the info how many foot pounds?
I just installed a FAST which why I knew the FAST specs are the same as stock in terms of sequence and torque values.
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Old 01-09-2011, 12:21 PM   #7
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I just installed a FAST which why I knew the FAST specs are the same as stock in terms of sequence and torque values.
I wasn't trying to bash your info!!! I have installed probably 150 of these and have never torqued them to those specs, And never had one with a vaccum leak!! The Composite is just not nearly as strong on the FAST as it is on the stock intakes. I usually Torque them to a Max of 80 # in.
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Old 01-10-2011, 05:25 AM   #8
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I had a vacuum leak when I installed the stainless allen bolts supplied with the intake. A week later I swapped back to the stock hex bolts, problem solved. A buddy had the same issue.
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Old 01-10-2011, 06:29 AM   #9
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I had a vacuum leak when I installed the stainless allen bolts supplied with the intake. A week later I swapped back to the stock hex bolts, problem solved. A buddy had the same issue.
dont say that lol i just ordered the stainless bolts for mine from thunder racing
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Old 01-10-2011, 08:53 PM   #10
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Quote:
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I had a vacuum leak when I installed the stainless allen bolts supplied with the intake. A week later I swapped back to the stock hex bolts, problem solved. A buddy had the same issue.
yup the reason why you had a leak was the bolts backed out...happened to me too even using red locktite after less than 100 miles they were ~35 in lbs

most have a very low coeff of friction between the aluminum block and stainless hardware...I switched back to stock and the problem was solved...

I would run the stock hardware
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Old 01-17-2011, 09:14 PM   #11
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i believe that stainless has a lower yield point and therefore stretches. just like if you get ss header bolts. they must be toqued multiple times before they are good. i have he ss locking header bolts and there was no chance they backed off.
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Old 01-18-2011, 04:55 PM   #12
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Quote:
Originally Posted by Squirts11 View Post
I had a vacuum leak when I installed the stainless allen bolts supplied with the intake. A week later I swapped back to the stock hex bolts, problem solved. A buddy had the same issue.
Glad I re-read your post!!! I thought you were saying you went back to stock Valley cover bolts!!!! You actually went back to the Black hex bolts supplied by FAST.. The reason I respond is cause we just pulloed a FAST 90 where whomever installed it used stock bolts on the valley cover and CRACKED the **** out of the intake!!!! $1000.00 down the drain for this guy.
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Old 01-19-2011, 01:37 PM   #13
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thanks for the info.
posting for future reference.
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Old 01-19-2011, 01:37 PM
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