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I have no experience with timing on Porsche motors, but I do have some experience with Subarus. I've found that if a motor is out of time when you try to turn the crank by hand, if you do it slowly enough, the piston will hit the open valve and stop. Forwards or backwards. If you're careful and don't force it, no damage happens. Are Porsche valves THAT fragile? You'd think that if you turn backwards slowly and carefully enough, if you hit, you could hit the valves without damage.
Also, if you ARE off time in a Subaru, you can ALWAYS rotate the motor backwards enough to put all pistons back in the middle position. Subaru's timing marks are, in fact, set at the point where all pistons at the middle position, not TDC. I guess Porsches are not the same?
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