Because that's actually what they are. I installed these on my 7.8:1 engine that made 453rwhp/484rwtq, I could see they had a steel center layer and always figured they would be at least as strong as stock.

After running with these gaskets I was able to chop up a used one to see what the construction looks like underneith.

There are three simple layers which include a steel center and composite gasket material on either side. This composite material is different than the stock weave, but appears to seal on both the block and head just as well. The steel center layer is crimped/bonded into the cylinder's steel seal ring to provide a firm backing.

Given my success with them and now after taking a closer look at their construction I would say: I highly doubt this gasket can be blown from cylinder pressure (even that caused by moderate detonation), very easily, if at all.

After running with these gaskets I was able to chop up a used one to see what the construction looks like underneith.
There are three simple layers which include a steel center and composite gasket material on either side. This composite material is different than the stock weave, but appears to seal on both the block and head just as well. The steel center layer is crimped/bonded into the cylinder's steel seal ring to provide a firm backing.
Given my success with them and now after taking a closer look at their construction I would say: I highly doubt this gasket can be blown from cylinder pressure (even that caused by moderate detonation), very easily, if at all.
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