I have a new build of a 522 stoker motor in a 71 challenger. 850 quick fuel carb. 16 degrees intial timing and 32 all in. 10:1 compression, aluminum heads, very mild cam. Idles very smooth, be cool radiator and fans. March pulley system, Temps at 190 to 195 when you keep it under 2000 rpms does fine. Punch it or take it up to 3000 rpms crusing and temps start rising. Mechanic is saying I am going to have to run race fuel or octane booster to get this thing to run. It idles for a hour with the ac on in Florida and not overheating just under higher rpms. Mechanic thinks we need to retard the timing and put bigger jets in the carb and a high flow theromstat. Any ideas?
