Generation III Internal Engine 1997-2006 LS1 | LS6
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anybody completely disassembled FAST intake?

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Old Apr 25, 2005 | 06:26 PM
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Default anybody completely disassembled FAST intake?

Has anybody ever taken their 90mm FAST intake completely apart. 3 pieces top bottom and middle section which is siliconed in and held with 8 torx screws.

I took mine apart and am wondering what kind of silicone is recommended. I also need to know if and where I can get the gaskets that seal the top and bottom half of the manifold. I pulled this gasket out which is actually sections with silicone at the connections.

I will call FAST tomorrow......but wanted to see if anyone has done it before

Thanks Tom Ulrich
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Old Apr 25, 2005 | 06:36 PM
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Why did you take it apart?
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Old Apr 25, 2005 | 07:20 PM
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wanted to make sure there were no problems I have really low vacuum.......any suggestions on putting it back together?
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Old Apr 25, 2005 | 07:25 PM
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Originally Posted by tomulrich
wanted to make sure there were no problems I have really low vacuum.......any suggestions on putting it back together?
You need to buy a new rope seal (call SDPC) and cut it to fit then put small dabs of sealant at the ends of each runner. Retighten using the original FAST assembly nuts and bolts to set the new seal before you install it.

BTW - Did you check where the MAP seals to the intake for leaks?
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Old Apr 25, 2005 | 08:31 PM
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I would not look to the intake manifold to solve low vaccum problems. Have you recently rebuilt or installed a built motor?
Originally Posted by tomulrich
wanted to make sure there were no problems I have really low vacuum.......any suggestions on putting it back together?
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Old Apr 26, 2005 | 10:41 AM
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The fast intakes are warped at the surface that matches up with the head/intake port. You probably have a leak in this area. Get another intake or use some hi temp silicon to make sure it seals. I have bitched about this before. 2 intakes purchased 12 months apart and both warped. I asked Kris to check mine before he shipped it. I can only assume all of them are warped. If they would only redesign the bolt bosses so the torque would straighten out intake all would be well.
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