I know some that swear by them, others that swear at them. we used them years ago on a 400SBC mud race engine, drivers side bank blew the head gasket and put us out of the running quick, we never narrowed down what caused it, but were kinda leery about running them since, we`ve pretty much stuck to basic fel pro`s, Detroit Gasket, Dana and GM stockers.
I was debating running copper head gaskets on the blower engine I am building. After talking to a gasket manufacturer, I decide it was not right for me (or most street cars). The reason is this, copper head gaskets need to be re-torqued regularly, he also said copper is great for sealing combustion but sucks for sealing water. This is why you have to coat them. There are some newer copper gaskets out that have silicone on them (like the composite gaskets), but they still have to be re-torqued regularly.
That pretty much made my mind up for me, I will be using a composite gasket (MLS= multi layered steel).
All in all I think the main drawback to the copper gasket is water leaks and secondly having to re-torque (water leaks are very common with copper gaskets).
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