Phantom Knock

Sorry you guys.Thanks for the input.I've been pulling the motor.Pulled the pan and it was spotless.Pulled the rod bearings.Perfect.Thrust clearance,.006.Couldnt find anything until...i looked in from the bottom of the timing chain cover,reached in with a screwdriver and found slack.I have a tensioner,and that thing was rock solid when i assembled it.So i pulled the cover.and the gear was way loose on the cam.Since im running an electric pump,we took the fuel pump ecentric off and made a custom spacer to take its place.Worked last time on the last cam,didnt have enough clearance on the washer to push the gear all the way on the cam this time.Tensioner made it feel right on assembly,and the one clearance in the motor i didnt check?Cam end play.Wont make that mistake again.Dont know how it didnt jack up the cam or motor,but it didnt.Put a MP hardened ecentric on with the right washer and tightned it and its fine now.That was close.Thanks for the help guys.