C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

L-98 Intake ?

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Old Jun 29, 2008 | 07:13 PM
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From: spring branch texas
Default L-98 Intake ?

Can some one tell me where these two sen's go?



And does anything go in this empty boss;

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Old Jun 29, 2008 | 07:49 PM
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The 2 sensors are 9 injector switch ( larger one ) and ECU temp sensor (smaller one ) they go in the front of the manifold.

the hole in the manifold is a water blead hole.

Last edited by adi4; Jun 30, 2008 at 07:13 AM.
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Old Jun 29, 2008 | 11:59 PM
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From: no. little rock arkansas
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the empty boss is the EGR temperatue diagnostics sensor. the block off
is for the EGR inlet from the exhaust header.

airdeano
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Old Jun 30, 2008 | 12:50 AM
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the hole in the manifold is a water blead hole.

On my '88 there is a metal line that runs from a "T" in the top heater hose into that hole.
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Old Jun 30, 2008 | 09:11 AM
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Originally Posted by js292

And does anything go in this empty boss;

Yes, a 1/8 NPT tap
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Old Jun 30, 2008 | 10:28 AM
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thanks guys, so since I'm not using the egr I can just plug that hole right?
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Old Jun 30, 2008 | 10:47 AM
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Originally Posted by js292
thanks guys, so since I'm not using the egr I can just plug that hole right?
Using an EGR block off plate, yes.
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Old Jun 30, 2008 | 11:36 AM
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thanks
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Old Jul 1, 2008 | 01:11 AM
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Thats a water passage and nothing to do with the EGR.I'm not sure you will get proper circulation if you block it off.I believe it should connect into one of the heater hoses.

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Old Jul 1, 2008 | 03:38 AM
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Originally Posted by staugur
Thats a water passage and nothing to do with the EGR.I'm not sure you will get proper circulation if you block it off.I
Had mine plugged for 5 years no probs.
I don't know what made the Vettes so special they need a vent; none of the aftermarket manifolds have a rear crossover.
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Old Jul 1, 2008 | 09:15 AM
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that water hose on mine its blocked too....no problems at all
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Old Jul 1, 2008 | 11:12 AM
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Thanks for all your help guys, when I saw the one pic of the hose connected to the manifold I couldn't remember my car having a hose like that at all. So I went and pulled the stock manifold out and it doesn't have that boss or the port for the block off plate I installed. So it looks like there are some differences in the early manifolds.(mine being a 85)
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Old Jul 1, 2008 | 06:43 PM
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Just thought I'd throw in my 5 cents worth.............did you notice???
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Old Jul 1, 2008 | 07:09 PM
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Mine is plugged too.....
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Old Jul 1, 2008 | 07:47 PM
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Originally Posted by staugur
Just thought I'd throw in my 5 cents worth.............did you notice???

that's got to be the best use of a nickle I've seen in awhile
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Old Jul 4, 2008 | 11:53 AM
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Here's another I need to verify before I screw it up. Am I putting the presure block on right? It's a super tight fit to the fuel rail, I've stripped the powder coating off the nipple and it seems like it will go on but I don't want to force it if this isn't correct/

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Old Jul 4, 2008 | 12:56 PM
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From: spring branch texas
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OK, got it figured out. the powder coating was interfering with it. Got another question though, anyone know where the little "L" bracket/tab that sitting between the rails goes or what it goes too?

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Old Jul 4, 2008 | 08:27 PM
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Originally Posted by rodj
Had mine plugged for 5 years no probs.
I don't know what made the Vettes so special they need a vent; none of the aftermarket manifolds have a rear crossover.
I'm pretty sure it's in there to circulate the collant and get any trapped air out.
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Old Jul 4, 2008 | 09:45 PM
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Actually this is a aftermarket manifold, and my stock manifold did not have that boss.
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Old Jul 4, 2008 | 11:25 PM
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The 85 did not have this hole. They used it for 86 and up. It had a tube that connected to the heater hoses.
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