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2006 CTS-V
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Discussion Starter #1 (Edited by Moderator)
Hi guys, the Fast install manual isn't particularly helpful, and I cannot seem to locate any videos or other guides/diy on how to replace the inner seal. My problem is that I've figured out that the bolts and nuts which go around the perimeter are missing from mine, there are 6 ea - 3 up front and 3 aft. I am also missing the valley cover bolts, so I ordered the full fast hardware kit, which has these missing pieces.

I have ordered a fast rope gasket, but cannot find any good info on how to install it. Anyone have some pics? All else fails I'll figure it out and take a very nice diy video for my channel and update here so someone can hopefully be aided in the future.

Does anyone know the torque for the fasteners on the front and rear? Not the manifold torque.

The problem with it sealing began with the shop removing the button head screws and replacing them with standard bolts, and just got worse from there. I don't understand why they chose to do this, and I'm still pretty pissed about it, but I also take it as an opportunity for growth and learning as I will be making a diy video of the install process to aid those in this situation going forward.

Now the rear half of the seal is destroyed and the lower to head seals are destroyed.

I've cleaned it all up, and the porting work was done by someone very skilled, it's a thing of beauty and I really want to get it back on the car asap.

There is not much difference between the LS2 and fast 92 stock performance wise, but after heads and cam I have really noticed a difference since switching back to my LS2 stock manifold.
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Also FYI for people swapping back to stock LS2 manifold with LS6 length injectors, you need a 1/2" spacer. I already had the FAST kit, so I had to find long enough hardware. The steam vent bolts are long enough to the mm to secure the taller injectors and rails to the manifold.

Any pointers from people who have done it are appreciated!

-Byron
 

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Super Moderator
'05 CTS-V
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8,246 Posts
I've never had mine apart. I coulda/woulda/shoulda sent it off to be ported while my car was down for over a year, but I wasn't planning ahead at all and by the time I thought to do that I thought I would have the engine back together in just a couple weeks. Then it ended up being another few months :rolleyes: , so I easily had enough time to do it. Ah well...

Anyway, I'm no help on the info you're trying to find, but look forward to your DIY video.
 

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'05 CTS-V, '12 CTS-V Manny Vagon
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Unlike @AAIIIC when I installed my FAST 90/90 all those years ago, I sent mine away to Tony Mamo to be ported.

You can try and reach out to Tony, and see if he can give some advice:


GL !

-Chris
 

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Discussion Starter #4 (Edited by Moderator)
Here are some pics of the damages now that it's all cleaned up.

I caught it just right, and if I had caught it later on, it would have ended horribly for me.

The hex head bolts did some superficial damage, but nothing that's not repairable easily.

I did a white light inspection for cracks and found none. I'm going to scuff the bottom outer shell, do a layer of DP190 to provide a layer of abrasion resistance surface just in case. When I install the button heads, I will fill the cavity with a mold release and then rtv just in case it makes contact.

I'm also considering a layer of DEI heat foil to see if IAT drops any.


-Byron
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'05 CTS-V
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I'm not sure what I'm seeing. I think the circular marks are what I'm supposed to see, but I don't know what those are.

Edit: Are those marks in the bottom of the intake manifold due to the hex head bolts on the valley cover? I honestly don't know what bolts I've got in the valley cover; I just had everything apart a few months ago, but I don't remember. I may have pictures at home that will help jog my memory. (I got my FAST setup used, so it's possible I didn't get valley cover bolts. But I kind of vaguely recall that I do have Torx bolts for the valley cover? I'll see if I have any pics after work later today.)
 

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Discussion Starter #6
I'm not sure what I'm seeing. I think the circular marks are what I'm supposed to see, but I don't know what those are.
What you are looking at is the damages from the hex head bolts.

It's from chaffing against the hex head bolts on the bottom shell of the fast 92.

This is why I will add a layer of epoxy based filler material, to ward off any further potential chaffing. I'll be installing the FAST button heads as I've ordered a full hardware kit, and doing this as a precaution.

-Byron
 

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'05 CTS-V
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Found a pic on my FTP site, I do have the Torx bolts in the valley cover. Phew! :)
 

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Discussion Starter #8
Got everything built up Thursday night and installed Friday morning.

I made sure to take a good video of the build up. The fast gasket wasn't long enough, so I reused some of the better condition pieces and placed the new ones around the perimeter and closest to the edge.

FYI when handling the fast 92 off the car, you use nuts to pull the intake pieces together, via the center 4 intake mount holes, this allows you to smoothly compress the seal and install the 6 perimeter bolts.

I used a lot of permatex black high temp to hold the lower to the mid piece as it's the only way to seal it properly.

All in all it's a 3 out of 10 for ease of doing, but 7 of 10 for attention to detail.

-Byron
 

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Discussion Starter #9
Here are the 2 videos I ended up making. I'm a far cry from a Hollywood studio, so please don't be too critical about the super awesome editing.

This is the build up for all 3 parts and how to seal it properly.


This is the install part that covers the injectors and fuel rail, valley cover bolts etc and removal only f the stock intake.


I have some other diy stuff on the channel also, and I'm documenting everything as I go.

-Byron
 

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Discussion Starter #10
Whatever you do, don't order that gasket set as it's not for an LS2/6 no matter what felpro says! Same for the TB gasket.

The part numbers for the fast stuff, o rings etc is legit and good to go. You need the larger injector O rings to seal the fast 92 properly, and the fast directions fail to mention that tidbit.

-Byron
 

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'05 CTS-V
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OK, I didn't have time to watch the video. Tried to scan for discussion of the intake gaskets, but didn't find it. So... What problem did you have with the Felpro gaskets?
 

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'05 CTS-V
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Just realized the reason I didn't find the gasket info is because I was scanning through the 2nd, longer video. If I had watched the first couple minutes of the first video, I would've seen it. Oops.

Anyway, when I had my intake off recently I used the ACDelco 12533587, which I seem to recall looked like the brighter green ones in your pics. I also seem to recall that the gaskets that came out looked like the Felpro ones. Based on your second pic, it looks like the Felpro ones would work, they're just a different style.

Have you talked to FAST to tell them their gasket/rope replacement part is too short? That's pretty crazy that the manufacturer's own part isn't right!
 

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Discussion Starter #14
Just realized the reason I didn't find the gasket info is because I was scanning through the 2nd, longer video. If I had watched the first couple minutes of the first video, I would've seen it. Oops.

Anyway, when I had my intake off recently I used the ACDelco 12533587, which I seem to recall looked like the brighter green ones in your pics. I also seem to recall that the gaskets that came out looked like the Felpro ones. Based on your second pic, it looks like the Felpro ones would work, they're just a different style.

Have you talked to FAST to tell them their gasket/rope replacement part is too short? That's pretty crazy that the manufacturer's own part isn't right!
The gasket was a freebie from a friend with an extra on hand, So I doubt fast customer service will aid me on that issue. It's holding quite well, so I am considering it a done deal.

The different style lower seals from felpro are for a ls3 intake, and may seal for a while, but isn't the proper part for the application.

I'm going to take a few minutes and exchange the gaskets later on next month during some down time for the same ac Delco gaskets you mentioned. It's pretty quick to accomplish now that everything is setup properly.

The gaskets which are lighter green towards the end of the build up video are my serviceable spares from the previous intake. I may just purchase the fast seals as they are $20 cheaper. I'll figure it out when I get there.

-Byron
 

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Discussion Starter #15
I located the previous proper button head screws for the fuel rail spacers, and swapped out the hardware.

I also decided to torque check the installed hardware and they snugged up another 1/4 for every installed bolt.

Torque check is a simple process and should be done with the fast hardware as it is well documented that it can loosen up on the various LS forums. Simply set the torque wrench to 89 inlbs and follow the sequence.

As they were all uniformly 1/4 turn loose, I can only assume this is the seal internally settling.

I will check them again tomorrow and if they move again, I will repeat the process and install a bead of torq seal, which will provide visual evidence of the bolt backing loose. You can do the same with a fine tip sharpie marker.

-Byron
 

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Discussion Starter #16
Changed back to stock mounting bolts. The fast hardware will not stay torqued.

I even verified the calibration on my torque wrench. Been tearing my hair out because it won't stay torqued. Even with loctite.

I will recheck the hardware in the morning before work to make sure it stays put.

For a more scientific explanation of why the fast bolts suck, see this link.


But just don't use the fast bolts and everything should be good.

-Byron
 

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Discussion Starter #17
It will again be coming off. Sigh.

Intake bolts keep loosing torque. I've got 3 sets of hardware, and all 3 sets won't stay tight.

I've ordered a thread cleaning tap and yet another set of stock bolts. I'll update of I figure it out. I'm assuming junk/oil on the threads of the cylinder head are keeping the thread locker from properly adhering.

-Byron
 

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'05 CTS-V
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Well, that sucks. I'll admit to having never re-checked mine on the couple of occasions I've installed it. Based on what you're seeing, I suppose I should!
 

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Discussion Starter #19
Well, that sucks. I'll admit to having never re-checked mine on the couple of occasions I've installed it. Based on what you're seeing, I suppose I should!
Good news is that they have stayed put the last few days.

I took some pipe cleaners and worked then through the mount hole threads, then again applied a dab of everyone's favorite blue goo.

I've torque checked it daily and no changes, so I feel I'm out of the woods almost. (I've learned to never say never with this car).

My new lower intake gaskets arrive next week, so it's coming out again to exchange them, and the current lower gaskets will be again put into my serviceable spares box. I went with the FAST part number 54009-8.

When I pull the entire intake again, I'll really get in there and clean/degrease the threads properly.

The neat thing about all this headache is that it will help the next guy down the road. And I've gotten to the Jedi skill level of pulling an LS2 intake on the car. :)

-Byron
 

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Discussion Starter #20
Going to be pulling the intake off again to add a heat shield to the base of it. 1 it will add a layer to the bottom to provide abrasion protection, and 2 hopefully limit heat transfer. There will still be a 1/8" gap between the intake and valley cover.

Should be a fun product, and if it works as advertised, I will add some to the volant box to further reduce engine heat entering the filter, and will add their intake sleeve to further the experiment.
If all goes well, I will have ambient temperature for my IAT and I'll consider anywhere near that to be a success.

-Byron
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