Hot-running LS6

[SmallHurst]

All of the above mentioned items are necessary for a cooler running engine, but some more things are necessary for everything to work properly. Make sure all of your shrouds are in place. Your fan shroud and fan position in the shoud is important. You need to have about half of your fan outside of the shroud so that it is pulling the air through and not just swirling inside. Also, the attachment under the radiator that protruds out. I have found that if I run my car over a certain speed without that piece in, the temp rises quickly. The air is searching for the path of least resistance and sometimes it will go under the car instead of through the radiator where the water can be cooled.
A clean radiator and block, proper functioning water pump and fan clutch, properly positioned shrouds, and a good flowing thermostat (Robert Shaw) will make any system work as intended.
Another piece of advice. Whenever you flush or change out your coolant, add back in a can of waterpump lubricant/anti-rust. This is one thing that is added at the factory, but is lacking in all antifreeze mixtures. Helps to keep all of the cooling system operating properly for a long time to come! [img]/ubbthreads/images/graemlins/naughty.gif[/img]