believe in "shoebox" and what he says. His page made my thermostat replacement very easy. A thermocycle is when the engine warms up tp operating temperature, is turned off, and cools down. If you do three over nights you are guaranteed to have three thermocycles. I eventually took a couple minutes and bled (burped) my coolant lines. This was the feather in the cap and my cooling is now consistant. I live in triple digit temperature country and cooling is critical. Sometime this week I am installing a manual fan switch and a LT4 knock module. Reason for the LT4 KM is because you have to remove the computer to do either of these so I am doing both at the same time. Come to think of it the LT4 KM might also help the cooling.

 

My car was previously cared for by a dealership and I am sure they followed the book. The thermostat I replaced was a 180*. I was surprised and expected it to be a 195* like most other GM vehicles. Any LT1 GMxperts out there?

 

Save your money, make your own. I see your sig says SLP Manual fan switch.

...and how's that?

Yup Injuneer

 

I think the stock LT1 F-body thermostat is 180 degrees. Autozone does not have the LT1 thermostat unless you get the Hypertech. Pepboys does have the correct 180 'stat.

 

Simple. Look in your owner's manual. (then apologize to Injuneer) You can also look at the thermostat, itself. It has 180 stamped right on it. AZ is famous for having the wrong info when it comes to LT1 thermostats. Why is it so strange that Hypertech makes a replacement 180° thermostat?

 

Last night I was reading the November 2004 issue of GM High-Tech Performance magazine. On page 70 "Tech" there is a one column Q and A about 160* thermostats. The Q came from Dave English and the A was from Ed Wright of Fastchip. I can't reprint the article but I will say it answers many of the Q's about the 160* thermostat and performance with reference to LT1 and LS1. Believe it or not I actually understood most of the answer. There is also a two-page article on "Understanding GM Temperature Sensors" that I find mind boggling. I must re-read it.

 

In addition to all of the evidence presented above, I still have the original t'stat that I personally took out of my 94 Formula - bought it brand new 8/94 - and its 180degF. Over about 6 years of posting on this board, I have participated in maybe 15 or 20 threads on the same topic. All the evidence supports the 180degF. Additionally, it is quite logical that a reverse cooled system would operated at a lower t'stat temperature than a conventionally cooled system.

Its "attitude" posts like yours that are really turning me off here... I'm at the point where I'm just going to give up trying to help people, and spend the hours I save each day working on my car.

 

My limited 35 year experience with Chevy small blocks taught me that retarding (excessively) the timing can cause overheating. So the question is does the LT1 KM retard the timing enough to cause overheating. Who knows the numbers on the two different knock modules?

I have already purchased the SLP manual fan switch and what I like about it is the simplicity of it. The switch is pretty much a plug and play unit. If there is a problem with it I can remove it from the electrical system in less than 5 minutes with no tools.

I suspected that Injuneer was a GMxpert. I will say it again, this group has huge pool of shareable knowledge. 4th Generation life made easy!

 

Injuneer don't do that, we need you way too much. Think of the Whole and not the Hole.

 

Listen to him Injuneer. You've helped out a lot with my progress on my 94 z28 (when i use to roam the boards a year or so ago). Now ive got a formula and wanna be just like you

Well not just like you...

 

Well I bought my 160 stat at Auto Zone last year. I went out today and checked it and its stamped 160 so maybe they dont carry it anymore or your local one doesn't have it but thats where I bought mine and it was fairly cheap.

 

You better check and be sure you got the LT1 stat and not the traditional small block Chevy stat. The SBC stat will fit, but it doesn't work quite right. I worked for Autozone, and when you look it up, it comes up with the SBC stat. Look on Shoe's site. He has a pic comparing the two.

 

Shoebox: When I bought my car the manual wasnt with it, so that is why I havent looked at my manual.....but I didnt know that info was in it. And as for the hypertech thing, I figured they werent manufactures of stock replacement parts, but I guess so.

Injuneer: I do apologize if that came off rude (well maybe it was, I had a crappy day at work and wasnt feeling to good so.....) I used to work at auto zone and have sold a few "stock" replacements for the lt1 and they were all 195 degrees....so that was my main basis for thinking that. I never looked at my thermostat when I took it out, I just pitched it.

Oh and I admit it I am one stubborn ****!

 

You don't need a paper manual. Just go to my Tech Page and look in the the right hand column for a pdf version of the manual.

 

I did check and I have an LT1 160 stat, but whatever. Maybe they dont carry it anymore or something. I know the difference and I know its not a standard sbc stat that I have.