I have looked and looked. Where can I buy one?

 

BeCool use to sell a 170* stat for the LT1. Cooper Standard is the manufacturer.

 

What's wrong with a 160 stat?

 

What is Cooper Standard's website? I cant seem to find it. There is nothing wrong with the 160 stat I have. Its just too cold for my application.
With the 160 stat the block temp is at 170deg. With the 180 stat block temp is at 190deg. I want to get the block temp at 180deg.

 

Ultimately, fans really control water temp, not so much the thermostat.
You could probably use a 160 and set your fan to come on 10 degrees higher than the recommended settings for the 160.

 

At cruising speed, the fans shut off at 40mph. I am not too concerned with the Sitting temps as much.

 

The thermostat controls the minimum temperature of the coolant. I don't see how your engine can be 170 deg with a 160 stat and 190 with a 180 stat..it just doesn't make sense. If the engine runs at 190 with a 180 stat it should run 190 with a 160 stat unless you adjust the fans to come on and cool it to a lower temp....

How are you measuring?
What are the fans set to?

 

The LT1 motor is reverse cooled. The heads get the coolant first then the block, giving you the 10deg diff. You will get a temperature differance from the heads to the block. The fans are off at cruising speeds and are also off when the temp is below the "on" setting. I have my fans to go off at 205 deg. MY problem is that the 160 stat is too cold and the 180 stat is too hot I need the 170 stat so my can runs at its most efficiant.
The more efficiant you run a motor the more power you can achieve. What a thermostat does for a motor, it keeps the min temp consistant, which is very important at cruising or moving speed.

 

That's pretty close. The easiest way to make power in an internal combustion engine is to increase the ignition timing. With that increase in timing comes an increased chance of detonation or knock. A cooler cylinder head with advanced timing will always yield higher power. That's why GM went to reverse cooling in the first place and that's why almost all of the hot-rodders go with a 160 thermostat. However, without the advanced timng, a cooler engine does have a lower thermodynamic efficiency yielding lower power and greater emissions.