Don't feel bad - I just destroyed my 3 liter 2 days ago at the track. Oiling was my issue, I ran the spray bar for extra added measure to the isky internally oiled cam and that backfired big time! Spray bar bolts backed out the cam towers so no oil was getting to the head - destroyed the cams and rockers, metal got to the bottom of the engine and I lost #6 connecting rod bearings. Hope the machine shop can save the V07 crank.
I know it sounds crazy but make sure oil is actually coming out the spray bar and getting to the cam also. With my spray bar failing, it destroys the rockers. If you are running a NISSAN spray bar I would ditch it ASAP. Buy the billet spray bar that won't crack and fail. Also safety tie the bolts that hold the spray bar to the cam towers.