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There isn't one. You have to remove the lower radiator hose, which is a poor design.
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You have the drain the lower radiator hose, 6.0 liter do not have a drain valve.
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jtd
There is no DRAIN PETCOCK on the radiator , You have to pull the lower hose to drain . Thanks GM designers someone asleep at the wheel.
check your owners manual
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5w-30.