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What year, make, model truck? Engine?

FWIW, the LS based engines run better with a 180* or 190* t-stat than a 160* t-stat. It would run slightly cooler with 160* but just because it will make it run cooler doesn't mean it is good for the engine and cooling system.
 

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JUGS Racing
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1,199 Posts
160 is too low. Hell the switching point between open and closed loop is 155*F. You may end up switching between open and closed loop which will ruin gas mileage. The lowest you would want to go is 170. I have a 170 but am also chipped for it aswell. I like it cause it keeps the tranny temps down too.
 

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JUGS Racing
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1,199 Posts
Make sure you get a tune afterwards if you dont have one already.
 

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GMFS Senior Member
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3,237 Posts
Leave the stock one. There isn't any reason to even go down to 180. Keeping the engine in its designed operating range will make it most efficient.

Sent from my ERIS-GSBv3.3 using Tapatalk
 

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ΜΟΛΩΝ ΛΑΒΕ
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8,527 Posts
Its a 1998 Silverado Z71 with the 5.7 350 LS1
Pics of said LS1 or GTFO!

Either it's a stock L31 350 which is nowhere near related to an LS1, or it is a swapped in LS1 which is not a "350".

And the lower thermostat will do nothing to benefit your stock engine.
 
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