How Hot is Too Hot
Short answer: As a rule of thumb: around 215°F is when you start watching the gauge, 225° is shut-it-down territory, 235°+ is dangerous, and 250°+ is where things warp and crack.
Octane doesn’t directly raise temps, but pinging from low octane makes the engine work harder and run hotter. To run cool: a 160° thermostat, a good engine flush, a decent water pump, a 50/50 coolant mix (slightly more water actually helps temps; distilled is best), run a little on the rich side, fit the 400/AC filler panels, and don’t skip the fan shroud.
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Content last modified: June 13, 2026 at 10:06 am
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