The bulk of the gaskets in the OEM kits versus those in the aftermarket kit aren't under enough stress for any minor differences to make a big deal. Just a little layer of sealant on the surface of the paper and assemble. The HG is really the only place I've seen a big difference.. that and the lower intake plenum gasket (OEM has a ring of sealant around the one coolant passage, some aftermarket do not).
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