Engine cooling problems, need help

[Gipperz06]

We recently installed a 383 and are having some issues with the cooling system...

Motor:
New 2004+ LS6 Block
Eagle crank
Scat Rods
Diamond pistons
2002+ GM MLS Gaskets< Is there is different gasket we should run for the 2004>
AFR 205 heads
G5x3 cam
Stock water pump
90/90 setup
we also replaced the engine coolant temp sensor with a Carquest temp sensor

When we started it up for the first time, we added coolant as we normally do and everything looked fine
Engine coolant temps came up to operating temps normally but once it got to 180-190 where it should have stopped, it kept going up until it sat @ 225-235.

Things we noticed..
The system seemed like it had an excessive amount of air...
Upper radiator hose didn't seem like it was full of coolant
No coolant smell out of the exhaust
Oil pressure 55#
Every reading seems normal
Almost like something is blocking the coolant flow

Problem is the car warms up and won't move off of 230degrees, doesn't go higher or lower.

we've changed:
thermostat
Water pump and thermostat

[DJWorm]

Most likely there is still air in the system. There is a specific process for removing air in the SERVICE Manual.

Something like:
1. Leaving the overflow tank cap off, Start engine & bring the Coolant temp to 170*. Add coolant if necessary. NOTE when TStat opens if there is air in the system it will burp and overflow. BE CAREFUL. DO NOT HAVE YOUR HANDS OR FACE near the overflow tank filler neck.
2. Reinstall cap and pressurize system.
3. Rev engine to 3500 RPM for 1 minute
4. Rock the revs between 1000 - 3500 RPM repeadidly for 1 minute.
5 Temps should be up to 220*
6. Shut off engine and let cool slightly
7. After 2-3 minutes SLOWLY and CAREFULLY remove cap to depressurize system.
8. Note fluid level and add again if necessary.

REPEAT until no more fluid is necessary after cooling down.

NOTE adding 2 pints of RED LINE Water Wetter will help in removing air.

ALSO remember to cycle the heater and A/C during the last couple of hot runs.

[Gipperz06]

we loosened up the crossover tube and it took almost a gallon of coolant, temps were steady @ 175-180.

Thanks dude!

[22655TD]

I have read a few threads on these air locked engines. I have never had any of this issues. I just fill it up and everything is fine. I wonder why some are stubborn and some are not?

[jub jub]

They're like a baby and need to be burped!