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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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7,966 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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Premium Member
'05 CTS-V, '12 CTS-V Manny Vagon
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6,076 Posts
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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2006 CTS-V
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371 Posts
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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2006 CTS-V
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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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2006 CTS-V
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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 videos. 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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