Ringing Up The Power
Here is a previously installed head gasket, which exhibits the grooves that were pressed into it by the O-rings. The harder steel wire makes impressions in the softer copper and provides a better seal than the gasket could alone. As you saw, the O-ring process must start with the machine shop cutting in the grooves, but installation of the steel wire can be done at home during engine assembly if you like to screw 'em together yourself.
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