I could only find ROW non us, but what I got was:
Intake opens 1 BTDC
Intake closes 53 ABDC
Exhaust opens 43 BBDC
Exhaust closes 3 ATDC
I didn't do the calculations but I am pretty sure you can calculate overlap/duration from this. I would do the calculations myself but do not want to mess up and give you false info. These numbers came from one of Bruce Anderson's publications.
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Kris @ Tech9
86' 930/GT-40R Sold 
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
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