overheating problem

[jcmg24]

Need help
If I cleaned the manifolds, replacing water pump and impeller (brand new), looking that I have pressure in the houses and !! keeps overheating my vortec 4.3 engine 2007…..what can I do ?
Did I need to look for cracks? My oil is clean…. No mix

[johnnygjr]

how many jcmg24 can there be??

[jcmg24]

I placed new thermostat . engine fresh water cooled. Need help ….it really sound good my engine, in low speed no problem, high speed immediately overheat . I’m asking because I am thinking to take a part the engine….Yesterday came from the shop with my aluminum head engine fixed…. And still the problem

[makomark]

exhaust elbows clogged...???especially if you use the engine in the brine...