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You want the 50888R gasket for a 2013. Chevy redesigned them to minimize the oil loss from crankcase and your 2013 came with the redesigned cover and gasket. No rtv sealant should be required. Not much torque on those gaskets though, 89 in pounds I believe on the bolts. And they need to be tightened in a particular order. I just posted a diagram in another thread with those instructions if you can search for it.
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