Variable Valve Timing. On the passenger side of the engine, one of the cam gears has a cone over the front of it. You will need to remove the timing belt cover to see it. It can be either on the intake or exhaust cam, the latter is closer to the firewall.
This a a Tbelt change video, notice that the VVT is on the intake cam. Have spouse watch the video, it is a good learning show. From the looks of it, this head might work for you also??
https://www.youtube.com/watch?v=Emsa-w-n93s
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My back feels better when I sit in a Volvo seat
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