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Can someone clarify part d?
Why does it say to tighten it more after tightening it to spec in step c. Does it basically mean to tighten a full half rotation after it's torqued to spec?
You're to tighten all the bolts to 33 ft-lbs, then tighten them all another 90 degrees. These are apparently one-time use bolts that are tightened to a certain stretch. The marks are to help determine which ones you've finished tightening and to watch for any of them backing out during use.
The SR20 four-cylinder used in the Sentra and 1st-gen G20 used this method on the head bolts.