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My amateur observation is that you can only be at zero valve spring load on one cylinder head at a time. If you've assembled the M96 you may recall two TDC locations. You install one bank, rotate the engine 360 degrees then install the chain for the other bank.
While you're on that second bank the valves for that head are unloaded, but at that moment there IS spring pressure on the first bank. In short, there is no position of zero valve spring pressure. A five chain motor, set correctly, will lock the head with valve spring pressure, allowing removal of all three chain tensioners
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