Upper Intake Replacement Photos - 56k WARNING - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-05-2004, 07:01 PM   #1
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Default Upper Intake Replacement Photos - 56k WARNING

Here are a few pictures from the first part of my project today. A few days ago, I noticed that I was low on coolant, so I decided to replace the OEM manifold with an Dorman aftermarket unit before the problem gets any worse.

My first sign of troubles.


Coolant leaking around the base of the upper manifold and EGR pipe.


A throttle in need of cleaning.


The lower manifold covered in oil and coolant.


If you look closely at the coolant passage on the right, there is a hole between it and the EGR pipe.


A comparison between the OEM manifold on the left and the Dorman manifold on the left. Notice how the ports are more reinforced around the EGR pipe on the aftermarket unit.
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Old 03-07-2004, 11:14 PM   #2
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Nice presentation of upper intake pics. Good luck with the new Dorman install.
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Old 03-07-2004, 11:32 PM   #3
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The install went well, I sure hope this is the last intake that have to buy.
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Old 03-07-2004, 11:34 PM   #4
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well thats some good info
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Old 03-08-2004, 12:03 AM   #5
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how hard would it be to make an upper intake out of metal? i mean why hasnt a company taken up this idea? i know theyd have like 50 buyers just from here at least. i mean would it just be insanely difficult to mold? im sure this has been discussed b4 but im bringing it up again.
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Old 03-08-2004, 12:20 AM   #6
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Quote:
Originally Posted by LittleHoov
how hard would it be to make an upper intake out of metal? i mean why hasnt a company taken up this idea? i know theyd have like 50 buyers just from here at least. i mean would it just be insanely difficult to mold? im sure this has been discussed b4 but im bringing it up again.
Someone did, maybe hector? Anyways... all of the power and the tranny was gone in no time...
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Old 03-08-2004, 01:30 AM   #7
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I don't understand why they bother to run coolant up into that intake in the first place. It looks like all it does is flow into a little passage in the throttle body to warm it. On my LS1 there are some small pipes that run coolant through the TB, but it'* a popular mod to use a pipe to bypass the TB. The thought is that the coolant just ends up making the TB hot and increased the intake air temp which reduces power slightly.
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Old 03-08-2004, 02:13 AM   #8
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The intake runs through the plastic intake to prevent temperature 'shock'. The idea is to control the temp (keep it hot) to prevent it from going hot/cold/hot/cold.

This is more stable. It warms up gradually, stays at that temp, and cools down gradually. There isn't an enrmous heat differential between the lower (hot) and upper (plastic) intake this way.

Moving this to 92-99, for it'* mechanical content.
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Old 03-08-2004, 09:28 PM   #9
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Nice job on the install, I wish I had the guts (and skills!) to do that.
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Old 03-09-2004, 12:47 AM   #10
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Thanks, it looks complicated but ití* actually pretty easy to install. Cleaning the throttle and lower intake was the hardest part.
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