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Discussion Starter #1
If I have the crankshaft 30 degrees out of TDC (against the direction of normal motion), can I freely turn the camshafts without worrying about valve-piston interference?
 

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Yes you should be able to do this. Take it slowly though. Any interference and you will immediately feel it, but with the crank geometry, it shouldn't be a problem at 30 deg.
 

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Discussion Starter #3
So for anyone in the future reading this: I can confirm that there was no interference.

It turns out that the machinist mixed up the intake and exhaust cams, always be sure to double check things like that!
 
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