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That bolt should be very easy to extract especially if you pulling the manifold all the way off.
Drill the hole for your extractor all the way through the bolt, then you can quickly heat just the bolt itself cherry red by directing a torch flame through the hole. Let cool completely, set your...
Can you post a picture of your broken bolt?
The rest of them you should be able to quickly warm the threaded ears on the cylinder head up one at a time with a torch without getting too much heat in the bolt, touch a candle to the threads to hopefully get some wax to wick back in them, then...