[69swb]

Originally Posted by LS short box

Trying not to hijack but on the LS question I've had super good luck with a single 16" Spal fan and no shroud. 180 degree thermostat in my summer hot rods. 187 ish in my LS6 swapped 98 Wrangler. I use the Wrangler to plow snow in the winter so I need some heat in the cab. Same 16" Spal fan and it has been great for over 14 years. Novak swap radiator.
ECM turns the fan on at 205 and off at 195.
You need to make sure that you don't have any air pockets. I finally bought a vacuum radiator thing at Harbor Freight and it works great.
I always run a 50/50 mix of antifreeze.
Just FYI my 2020 Silverado runs at 210 day in day out.

Yeah my wife’s 2017 silverado 210 all day long