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1. The factory is probably 180...I think I usually run a 160.
(some will argue a 160 will move the water through your radiator too fast-
they could be right...I guess)
2. If you've flushed everything, that's good. Radiator look clogged?
3. I think 50/50 is not the best mix. I run 100% water because I go to the track. That and a little water pump lubricant is the best.
Other things you should try.
-Tune your carb. Lean conditions can raise an engines heat range dramatically. Also, gas...what octane are you running?
-Timing. Advance it a little. Not to the point of pre-ignition- that will cause
detonation, which will also raise engine temp. But too retarded will raise
temps. It's a fine line, but a cheap one to play with. Bump a few degrees and take it for a spin.
-Have a trans cooler? It'll move hot(170-220 degree) fluid away from your
coolant. Your radiator is already taxed...lighten the load.
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