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

vacume line?

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Old Apr 11, 2009 | 05:13 PM
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canon1414
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Default vacume line?

Hi guys, I have taken my LT1 intake off of my 1990 and going back to the stock L98 intake. I have it mostly back but their is a couple of things I need some help with. I have deleted the EGR and the air to the cat. So my first question is what does the manifold vapor tube on the back passenger side of the lower intake connect to? and what does the exhaust emission control vacume fitting which is on the rear of the plenum connect to? and lastly where does the pcv valve on the driver side valve cover connect to?


Thanks for any help, Mike
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Old Apr 11, 2009 | 08:43 PM
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Originally Posted by canon1414
what does the manifold vapor tube on the back passenger side of the lower intake connect to?
Assume you are talking about the steam vent tube? Cap off or plug.
Originally Posted by canon1414
where does the pcv valve on the driver side valve cover connect to?
Goes to fitting on intake base next to # 5 injector
Originally Posted by canon1414
what does the exhaust emission control vacume fitting which is on the rear of the plenum connect to?
Large fitting on rear of plenum is for brake vac line
Two smaller ports on pass side supply vac to FPR and vac line to cabin for HVAC

Last edited by rodj; Apr 11, 2009 at 08:47 PM.
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Old Apr 11, 2009 | 09:18 PM
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Hey Mike, I'm not far from you if you need to take a look at something. I can take some snapshots over the weekend if you need any.

How come you're changing back? Most guys like the LT1 swap.

Matthew
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Old Apr 11, 2009 | 11:22 PM
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are you selling the LT1 intake?
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