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Duane is right on the money.
My 427 with aluminum Heads and intake, single 4, solid lifter, loves the 180 degree thermostat. Needs to maintain that 180-195 temp for the fuel air mix in the runners. I tried the 160 degree and my engine didn't like it. Water Wetter from Red Line Prod. is good as well as distilled water. The little hole trick works also. Good luck!
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