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Discussion Starter #1
GM has changed the thermostat design for 2004 so the usual thermo with housing replacement won't bolt up. It is now just a thermostat by itself that will drop into place. I'll post part numbers for the new 160 and 180 thermos when I receive them.

Tom



Order line - 1-877-4-TBYRNE
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I was going through old posts. Have the new 180 degree thermostats been developed yet. If so I want one.
 

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No but 160* thermos are out. I know the one I got is made by lingenfelter. Tbyrne has them on his website, like $19.99. Much better than the $40+ for the '99-'03's.
 

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We have SLP's 160 thermos in stock but I just need to confirm they will work on a 2004. I'm 99.9% sure that this will bolt on but I'd hate to send out hundreds and find that they won't.
 

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Tbyrne, is this just the stat or the stat + the housing? And what is the disadvantage of going with a 160 stat. I have heard that it can cause the engine to run rougher and all. That is why I had been wanting to go with a 180.

I talked to a tech at hypertech and they are still waiting on their stats for the 2004 models. Are they only going to be offered with just the stat or will they eventually be offered with the housing and all?
 

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I just confirmed that the thermostat that I mentioned will work on the 2004+ trucks. This is the thermo by itself. The 1999-'03 need the thermo and housing because it's one piece. GM changed the design for 2004 so it will sit inside the stock housing like most other opplications.

I usually run a 160 in all of my vehicles that aren't driven in the winter (need heat! :) ). I've never come across any problems.
 

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I read this sometime back on the LS1.com forum and kept it. Maybe somebody who knows more than I do can support or rebut it.
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The LS1 guys had the 160 vs 180 thermostat issue come up and the recommendation was:

"The 180 thermostat will not change your temperature much at all, so if you want cooler running temps go with the 160 thermo. In order to take full advantage of a colder thermostat, you must have your fan settings set to come on sooner. A thermostat opens at the given coolant temperature (i.e. - 160* for a 160* thermostat), sending coolant to the block earlier or later. It does not directly lower operating temperatures. With the stock fan settings and a colder thermostat, the engine will run cooler on the highway, but as soon as you get stuck in traffic, even for a short time, the temp will creep back up again."

and

" I put a colder thermostat in my car and the gauge reads the same temperature as before! What happened?

Answer: If you've taken the steps to modify the fan settings (such as the HPP3) then you should see a difference in the temperature gauge if you have a 98 F-body. If you've got a 99 or newer, you must keep in mind that the gauge is not accurate enough to show a drop in running temps. It is set up to go to a preset level and stay there even if the operating temperature varies by 15-20F. The 98 gauges will fluctuate as the temperature goes up and down, and GM felt that new car owners might be alarmed with this happening. In essence, the 99 and newer coolant gauge is little more than an idiot light."


How can I modify my stock thermostat to open sooner?

"How to make your own custom Thermostat
http://www.ls1.com/customthermostat.htm

http://www.ls1.com/customthermostat_files/image001.jpg

The thermostats on the 98+ LS1 engines are designed in one piece which includes the outer casing.

http://www.ls1.com/customthermostat_files/image003.jpg

The Thermostat can easily be dismantled by twisting out the upper portion that holds the springs down as shown.

http://www.ls1.com/customthermostat_files/image004.jpg

The wax which controls the opening and closing of the thermostat through it's expansion if inside the casing. You'll notice the channel at the bottom of the casing.

http://www.ls1.com/customthermostat_files/image005.jpg

Here you can see how the plunger which controls the opening and closing of the valve falls into this channel.

http://www.ls1.com/customthermostat_files/image006.jpg

To make the thermostat opening earlier it is quite simple. All we need to do is make the plunger longer causing the wax to open it earlier. This can be accomplished by placing a spacer at the bottom of the channel where the plunger sits. People have found that using a spacer of .06 - .09 will yield a thermostat which will open between 172-180 degrees."
 
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