There are several bins on this board with vortec head spark tables. When you say 40000 knock counts, are you saying you start out with 40000 or are they continually increasing as you datalog? Here is a thread with the factory spark tables from a L31 (5.7 Vortec ) with the black box pcm. You can use these tables to interpolate a stock spark advance table into whatever mask you are running.
http://www.gearhead-efi.com/Fuel-Inj...ec+spark+table A datalog will show where you are getting knock counts and how much timing the PCM/ECM is pulling to stop the knock.
Hope this helps,
Brian
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