2005 LS2 vette timing advance histogram?

Is this showing the true total advance or net advance?

I've found these vettes don't seem to like more than 21 degrees or so during WOT pulls. With more it has KR even with AFR dialed in w/ WBO2.

Are these LS2s that much different than the LS1s or LS6s? Seems like you could get 5-7 more degrees in those.

Anyone know?

Thanks,
Joshua

The bigger bore seems to affect the LS2. Plus they have more CR than LS1/LS6. Don't know why but the stock cal's always seem to knock.

EC