High temp silicone on the mating surfaces, let it skin over for 15-20 minutes, and assemble. Let it sit overnight before starting it. There are a ton of racers that only use RTV on their headers, and no gasket.
I've seen it repair turbochargers, so if it can stop a turbo from leaking it can surely fix naturally aspirated. I used it on a set of Hooker header gaskets installed in 1989, still not leaking 33 years later.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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