i didnt have to really flush anything in my case. im not sure how others do it, im sure they explain it on ls1tech, i just hate that site because everyone thinks they know better.
I had a new brand motor, all new hoses and i flushed the rad with a hose while it was out of the car. once everything was dry again and clean, then it got reinstalled. I even removed and flushed my overflow tank and got a ton of sludge junk out of it. Also when i filled it, i did an exact 50/50 mix of coolant and distilled water.
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