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What should the running temp be on a 1965 mustang 289?

The ideal running temperature for a 1965 Mustang 289 engine is between 180-200°F (82-93°C). This is the range where the engine operates most efficiently and avoids overheating or excessive wear. However, slight variations are acceptable depending on driving conditions and ambient temperature. Always consult your owner's manual if you have one, or a reputable Mustang repair manual for specifics.