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Remove all the spark plugs and locate the number 1 cylinder. Place finger over spark plug hole and crank engine till it is putting air pressure on finger (this indicates valves are closed and engine) is compressing) insert wooden dowel in plug hole now and crank it by hand to watch for dowel to reach top before it starts back down, and adjust for highest point. You now have #1 at TDC. check cam lobes to make sure the valves are closed and adjust accordingly. Look for video on youtube.
I suspect that you at least need to check the valve lash but as long as your head gasket is not dramatically different than original (which it should not be because that would change your compression ratio) you should be close to okay (I would check it). Or if you had any machine work done to the head, in which case you certainly would need to adjust the valve lash.
Are you needing the twin independent variable cam timing info or is this a cam replacement initial cam timing setting? the variable valve timing itself is dependent upon the part design, and is usually controlled by oil flow (causing the timing to change hydraulically and seems transparent to the driver). However, when replacing the cam, the timing is more of a position issue using the marks on the engine and camshafts to make sure the shafts are in the proper position.
If this is for a replacement, use the marks on the block ensuring the current valve position is the proper in relation to piston position (otherwise your pistons will punch the valves and blow the head)
mark all the caps (cams) clearly punch them so you are sure they will be installed in the same order. Pull off exhaust manifold. Remove all injector plugs and wiring (look carefully) remove cams. Remove cam followers Carefull one lot is different to the other side take note and mark them.remove head bolts-remove head.The head should be sent to a specialist, to save money you could supply the valves and the gasket set. Should be available from any good after market spares outlet. My advice is to use new head bolts. Torques differ engine to engine but normally I use 20nm + 40mn + 90 degrees + 90 degrees but please check specs for your vehicle.While the head is off check condition of pistons, if all the valves took a hiding so did the pistons (could be collapsed) get someone to look and give you advice, could save money in the long run. Not such a bad job to pull the sump and do a proper job anyway. Also get your injectors checked/cleaned if you can afford it- usually a problem on these motors. Sorry for slow reply been ill. Let me know - Shaun