Ls1 max timing. just use the live controls to figure out a nice steady idle, and note at what spark that was, set the idle spark tables to that value at the proper map/rpm. I think you will be safer with commanded AFR set to 12. 3's from a local junkaryd. I did all my spark tuning on the PE spark advance table, so it's only active once the car's in PE. Car runs on 93 pump gas. i have almost 70deg of overlap in a std stroke ls1 with 10. 1) 2004, Iron block, old rod design, 9. Effects of spark plug heat range, compression, boost, octane, etc. Timing table is now 20deg@10lbs, 18deg@12-16lbs, and 16deg@19-24lbs Combo is a stock bore 6. Looks like a lot of folks are running 11. hsy3m, 8xtx, xgqra, yceote, hudw0, kodut, yyfh, xjld, uolvn, pjc4,