LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Thermostat question

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Old Dec 11, 2007 | 06:52 AM
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Well I was thinking all of us that are running the 160 stats are we hurting ourselves... not letting the engine heat up enough to maximize combustion?

car runs 175-180 all day usualy have to beat on it real hard to get near 200-210 middle line

anyone switches from a 160 to a 180 and found better anything?? just wondering
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Old Dec 11, 2007 | 08:19 AM
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My opinion:

Daily driving, use the stock temp t-stat. The engine is designed to run at that temperature. It helps the engine keep itself clean.

Drag racing, use a 160. This, along with fan control, will allow you to keep the engine cooler while waiting in line.
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Old Dec 11, 2007 | 12:02 PM
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Put a 180 in it, the best of both worlds!
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Old Dec 11, 2007 | 01:16 PM
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i recently switched to a 180...160 made my heater useless,and it gets cold this time of year.
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Old Dec 11, 2007 | 04:13 PM
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They come with a 185º stock LOL
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Old Dec 11, 2007 | 04:17 PM
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no they dont LOL! 195 is stock LOL!
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Old Dec 11, 2007 | 04:18 PM
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Originally Posted by Formula350
They come with a 185º stock LOL

it's a 180* last time I checked. I ran a 160* T-stat in the winter and the heat was just fine. Output air was cooler than the 180* T-stat but it was just fine. If you're concerned about not getting your car up to operating temps then you're not driving it long enough.
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Old Dec 11, 2007 | 04:18 PM
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195 stock
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Old Dec 11, 2007 | 04:22 PM
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want to bet
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Old Dec 11, 2007 | 04:24 PM
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+1 for above, again all of gm 350's have 195ts stock! 180 is about optimal for a daily driver, unless you tune for a 160.
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Old Dec 11, 2007 | 04:28 PM
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Originally Posted by kinglt-1
+1 for above, again all of gm 350's have 195ts stock! 180 is about optimal for a daily driver, unless you tune for a 160.
sorry King, the LT1 was an exception. All LT1s OEM Thermostats are 180*. For awhile the 180* and 160* T-stats were the only LT1 specific units available. Just in the recent years have they come out with the oddball temps.
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Old Dec 11, 2007 | 04:28 PM
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word? why is my heater cooler with a 180 then...
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Old Dec 11, 2007 | 04:33 PM
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Yes your right I just checked. The haynes manual say operating temp for factory thermostat is 185-205.
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Old Dec 11, 2007 | 04:35 PM
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oh **** that sucks then...i think my heater core is clogged
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Old Dec 11, 2007 | 04:37 PM
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my 95 formula had the original t-stat in it and it said "192-195" on the bottom side of the copper.the same for my 95 and 96 when stock.
192-195 is stock
180 is great all around
160 is for racing etc.
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Old Dec 11, 2007 | 04:38 PM
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for teh last time it's 180*
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Old Dec 11, 2007 | 04:41 PM
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I could of swore that mine said 192-195 also, but buffman say's it's 180. I thought the only aftermarket thermostats was 180 and 160, stock was 195. Like I said the haynes manual says operating temp range for the thermostat is 185 to 205. So it would make sense that 195 is stock, that wouls give it plus or minus 10 degrees of variance. IDK?
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Old Dec 11, 2007 | 04:52 PM
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12555290 Part #
Attached Thumbnails Thermostat question-getimage.jpg  
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Old Dec 11, 2007 | 05:10 PM
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its not a matter of heating up for combustion, the idea with running these motors hotter, and getting them up to temp faster is mostly for emissions. sure from the factory the engine specs were assembled for the temp, but for efficiency... the heat brings it down. i run a 160 Thermostat, but my car is tuned to not go into closed loop... it was compensated for in the tune. but the only thing i could see is the heat being a bit warmer with 180 tstat
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Old Dec 11, 2007 | 05:12 PM
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and remember an LTX will have hotter cylinder bore temperatures because of the reverse cooling.
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