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Old 04-26-2008, 10:53 AM   #1
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Default Lower Intake Manifold

I haven't been around for a while, due to a busy work schedule, but spring is here and I am starting to get some spare cash to put towards car maintanence. I have a list of things that I would like to FINALLY get around to, including fixing my A/C (the compressor went last year and I put a new one in, but it had a leak somewhere), fixing a stability system code, and FINALLY getting around to my lower intake manifold. I have never done anything as involved as the LIM gasket, but have looked through the techinfo on it. I wanted to be sure of some things before I ordered the parts, etc.-

1. Since my car is Super-Charged, the UIM gasket is not needed correct? I only need to do the LIM gasket?

2. The aluminum GM gasket is the way to go?

3. Are their any other parts that I will need or should replace while I'm in there?

4. How do I drain out all of the coolant?

Thanks for the help, I look forward to your responses!
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Old 04-26-2008, 11:43 AM   #2
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1 there is still a gasket between the sc and the LIM. some listings will call it the upper intake, even though the sc has replaced an upper intake.

2 yes, go with the aluminum, or fel-pro at the very least.

3 bypass elbow, inj o-rings, t-stat, maybe more, but thats all i can think of right now

4. there is a drain plug at the bottom of the radiator on the drivers side. do a flush with some water before you put the new coolant in.
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Old 04-26-2008, 05:36 PM   #3
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Default Re: Lower Intake Manifold

Quote:
Originally Posted by jseklund
1. Since my car is Super-Charged, the UIM gasket is not needed correct? I only need to do the LIM gasket?
You will need to remove the supercharger and replace the o-rings and gasket between it and the LIM.

Quote:
Originally Posted by jseklund
2. The aluminum GM gasket is the way to go?
Yes. GMpartsdirect has them for $39 + shipping , iirc.

Quote:
Originally Posted by jseklund
3. Are their any other parts that I will need or should replace while I'm in there?
As Wes suggested, coolant elbow, o-rings for the injectors, thermostat, t-stat gasket, plus blue threadlocker for the LIM bolts, coolant, brake parts cleaner, gasket scraper. If you haven't done so in a while, you may want to remove the throttle body and clean it, the MAF sensor (carefully), and the IAC passages and pintle. If you do the TB work, you will need a new TB gasket.

Quote:
Originally Posted by jseklund
4. How do I drain out all of the coolant?
By removing the knock sensors, but you don't want to do that for a lot of reasons. Here is a topic discussing how to flush your cooling system: http://www.bonnevilleclub.com/forum/...ic.php?t=96685 I don't like to use the radiator petcock because it is slow and prone to breaking and leaking once disturbed.
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Old 04-26-2008, 06:29 PM   #4
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Thanks for the replies! I will be ordering these parts in about 2-3 weeks once I get paid on some things. As for the T-Stat- I live in Mass.- do you think I should go with a 180* thermostat? Or stick with 195*?

I noticed in the write up on the LIM that many of the people here have gone with the 180*, but it states that there are reasons you may not want to do that in certain climates.

Thanks again. The help on this board has probably saved me thousands of dollars!
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Old 04-26-2008, 11:58 PM   #5
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Quote:
Originally Posted by jseklund
Thanks for the replies! I will be ordering these parts in about 2-3 weeks once I get paid on some things. As for the T-Stat- I live in Mass.- do you think I should go with a 180* thermostat? Or stick with 195*?

I noticed in the write up on the LIM that many of the people here have gone with the 180*, but it states that there are reasons you may not want to do that in certain climates.

Thanks again. The help on this board has probably saved me thousands of dollars!
I run a 195F in the winter, and change it out to a 180F in the summer. I like the lower temperatures in the summer to take the strain off my transmission.
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Old 05-17-2008, 05:41 PM   #6
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Not to dig up a couple week old thread, but I'm about to order these parts when I get paid this week coming up. I want to make sure I order all of the right things:

1. GM Aluminum LIM Gasket, Part #89017816
2. GM Coolant Bypass Elbow, Part #24503423
3. Supercharger Gasket, Part #?????- Any help would be appreciated!
4. Fuel Injector O-Rings- AIRTEX Part # 1G1018 (Rock Auto)
5. 180* T-Stat (I'll put the stock in during the winter)- Gates PN: 33428S
6. T-Stat Gasket- Fel-Pro PN: 35666
7. I have a throttle body gasket already.

I know I will also need some cleaner. coolant, blue thread locker.

Also, while I'm doing this, and have things apart, I am going to replace the valve cover gaskets because I have been noticing an oil burning smell when I am going up a hill slowly or stopped. I figure while I have everything apart, I may as well fix this too.

8. GM Valve Cover Gasket- PN: 24503937.

Do I need to order 1 or 2 of these? $13 seems cheap.

Thanks again for all the help, clarification, etc. I just want to be sure I understand this and have what I need before I get into it.
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