The head gasket issue on the 7M motor is from inadequate head bolt torque from the factory, as well as a spec thats just lower than it needs to be.
Factory bolts can be torqued in the range of 70-75 lbs and solve the problem most of the time. Using ARP bolts and a metal head gasket goes one step further and can handle an awful lot of boost without blowing the gasket.
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