[elmariachi]

I have tweaked the timing between 16* and 20* base and 18* additional, coming in at 1200 and all in by 3000. Hasn't really seemed to matter, no pinging/knocking/dieseling on accel or shutoff. Carb is a 750 Mighty Demon annular/mechanical, that just replaced a 850 Speed Demon that ran great on the dyno but like sh^! on the street. Mixture is around 2 turns out on the screws, I have chassis dyno time scheduled to do final tuning as soon as I can sort this out. Plugs are tannish brown and look good. Car does need some final tuning but it hauls some serious a$$ for only 450 HP 485 ft lbs tq.

Water pump pulley is 6.5" diameter stock and balancer pulley is 6.5" Professional Products SFI. Bill, coolant mixture noted above in original post. I started at 50/50 distilled to Dexcool but I am down to 70 water 30 Dexcool +1 bottle WW. Hasn't made a difference. Radiator size is where I think this is headed.

Guage is accurate, this damn thing is getting hot according to an IR gun. Hoses have springs in all lower bends.

I am running the expansion tank at half full per threads here. Should I top it completely off and see if that other quart makes any difference?