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Head gaskets blow because of a poor tune. The only other reasons for a healthy engine to blow HG's are excessively high boost ie 22+psi or just very high hp. Ill use the 2.0L toyota engine again- the early variants use paper head gaskets which do not blow with well over 400hp when properly set up.
You could get a company such as cometic to custom make you metal hg's. I would have no idea what the stock ones are made of. But remember metal hg's just move the first thing to blow up to rings instead. A lot easier to replace a hg than piston rings.
Where did you get your 12psi info from? Is this c20at specific? All engines are different. I wouldn't doubt the c20at would blow hg's at 12 but only because it probably runs out of injector, or pump capacity etc.
Don't know the name but some companies offer inserts for the block. Google subaru open deck to see the process they use since they do it all the time with the ej20t. I think you can also get it custom filled which you would have to do. I don't think it is worth it. Its not easy to blow your cylinders apart, or flex/crack the block.
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