I didn't get any real help on the internal gen IV forum, so I want to pick the most advanced brains on LS1 Tech. Is that you?
It has to do with max timing on an LS3 headed engine. I know the combustion chambers on the LS heads are very good, and that with an efficient CC, the timing shouldn't need to be advanced as far as, say, a SBC. On a carbed intake rectangular port head, should the max timing be the same as with the front feed , plastic intake? I have a GMPP dual plane on a crate LS3 with a smallish custom cam (220-230 at .050 108+4, 629 lift). Right now my timing is set at 34* max and that falls about middle of the road for what the carbed LS3 head engines are running over in the carbed LSX forum on LS1tech. Am I leaving power on the table with my timing so high? Im working out some traction issues right now, so good data at the track is nearly impossible to get. So far at 3500lbs Ive gone 11.65 at 118 (1.876 60 ft playing patty cake with the throttle) with a 2800 stall and 3.42 gears in my 72 Camaro.
Is 26 to 28* right regardless of induction setup?

 

On any engine it will tell you how much timing it wants. 1 Depending on the combustion chamber design.2 The amount of quench. 3 How the quench area is configured. 4 The amount of cylinder presser. 5 Type of fuel. 6 The load the engine will see.7 The PRMs.8 The head flow. 9 Engine temperature. 10 steel head or aluminum ? Some engines make more power on the dyno with a given setting. The same engine in the car at the track will want something a little different. So if you engine runs best on 22 degrees or on 45 degrees give it what it wants. There is no set timing for any engine. There is more but I type to slow. So are you confused yetJ