Need help with 5.3 Truck Norris Knock retard when closing throttle.

[Tanelipaneli]

Hi!
My first post here.

I have a 5.3 swapped OBS Suburban with a truck norris, LS7 lifters and better springs. Otherwise stock.
CL SD tune.
Stoich at 14.4 due to E10 fuel here in Sweden.
The LTFTs are ok and it idles and drives ok. Still have WOT, spark and fine tuning to do.

My consern is that I get knock retard when releasing throttle or sometimes going from drive to park.
The spark table is pretty much stock and I have taken several degrees out of it and still getting knock in the same places. I did desenisitize the sensors a bit.
I Never get knock on accelerating. (Mind you I havent done any WOT).

I?ll attach a log and the .hpt

Anyone have an idea what could cause this?

/Daniel

[blindsquirrel]

That's not the typical conditions where you will see real knock. Check for anything loose underneath, anything rubbing, engine mounts, clearance to all the driveline stuff.