Perfect opportunity to swap in a S54! Jk. But really it couldn't hurt. You will definitely need a torque wrench for rebuilding a motor. You don't want anything inside the head coming loose, or snapping from over-tightening. Never done a head gasket myself, but it should be fairly straightforward on an inline engine. I'm sure you can find a YouTube video to walk you through the whole process. And if not, there's definitely published material out there on the subject. My biggest worry would be timing and the special tools that may be needed for it.

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