With our combos, our idle side poppets are below 8. Again these setups are basic BBC, 8-71s and probably lower hp than what some of you are talking about. This is probably why the timing had an effect on the "surge". Like Mike said earlier it probably changes the idle enough to smooth it out. Big Steve our timing stayed locked at 32 to 36 depending on track and other factors. We don't run a grid.