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Jim - I have the 402 SRTW. Timing set at about 12 at Idle...30 at 4000 RPM. When hot run anywhere between 80 and 100 C tops. Have you pulled the sensor bulbs and tested their accuracy (usually with a known water temperature)? Another way to check is with an infared temp gun on various parts of the engine. If you can eliminate the gauges being off then you can start to diagnose the engine itself.
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