Engine Block Coolant Drain Plug Locations / Size Question

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03Yukon

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I'm having trouble identifying the drain plugs on 5.3L. One page of the shop manual shows them near the front and the next page shows them near the rear.

There are two rather large plugs near the rear - if these are the one's, would anyone know the size of allen wrench to use? It looks very big ... maybe 3/4 inch or larger.

Thanks for the help.
 
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