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What's the general consensus of which exhaust gasket to use for header installations? Chevy OEM? Is there a difference between LS1 and LS6 gaskets, like D-port or O-port?

I have SuperMaxx LT headers and they come with a gasket set supplied by Dynatech, but I was just wondering if using OEM or Felpro, etc. is a better choice.
 

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Use only stock GM- LS1 exhaust gaskets, NOT LS6 gaskets.

GM LS1 gaskets (#12558573)
 

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I think the key is port shape of the supplied gasket. If they're round, you're good to go.
 
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