I just caught up on this thread and I don't drive a Nissan, but in reading I noticed something that hasn't been mentioned here. If the timing mark is on the outer ring of the harmonic balancer and that ring has shifted relative to the crankshaft, you have no clue what your timing is set to. That could be the cause of the detonation moreso than an overrev situation.
Back to regularly scheduled programming...
Butch Kummer
Former SCCA Director of Club Racing (July 2012 - Sept 2014)
2006, 2007, 2010 SARRC GTA Champion
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