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To be honest ,I don't know ,maybe to help hold in place because those gaskets & shims are real tender an is easy to bend & damage! The torque I would imagine ,is to snug them down an tighten them in sequence until they don't turn no more ,sometimes you hear a click noise ,that will let you know...

Sometimes the screws will work loose an cause leaks an sometimes the factory doesn't get them tight enough ,I've gotten new engines with loose heads before. Just do what the directions say an you can also go back an tighten a little after engine is heated ,an no ,you don't want to over tighten...