Well that's all I get with this new built cammed 5.3L 2000 LS engine. Even with a flushed tank on high octane fuel it's pulling 8* timing at WOT and pulling some timing even if not at WOT.

The knock sensor were replaced along with the harness from them during the rebuild because they were oil soaked and nasty.

Can't hear a ping. Even with Low Octane table it's pulling timing. Motor is a quite as could be.

Any ideas on how to diagnose them, things that could be done wrong, did we get some bad AC/Delco knock sensors, etc... any ideas. We've done all the regular stuff like looking for something loose or rattling...