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As with any twin cam engine, if you turn the crankshaft 90 degrees, all the pistons will be half way in the bore.
You can turn each cam one at a time, to the timing marks.
Then return the crank back to it's timing mark, if you went forward 90, turn back 90.
Now fit the rest.
Be aware that some heads aren't meant to be shaved, piston to valve clearance could be an issue.
Hi there again,
Some engines are ok, depends on the manufacturer.
Most engines have a minimum thickness allowable after machining.
If your head is still above the manufacturers min thickness, you should be ok.