Re: 327 Engine Operating Temp Range

Posted by TxGoat On 2023/4/14 13:28:59

With modern oil and anti-freeze and a pressurized system, you're fine up to 200-210F. The coolant will be hottest at the cylinder head outlet. Depending on how much presssure your system holds, and how far above sea level you are, your car should not boil over at 230F or less, unless there are hot spots in the engine from a bad water distribution tube or too much debris accumulation. It seems to be normal for most cars to run hotter in hot weather and a little cooler in cool weather, in spite of thermostats. Engines need to run at 180 to 185 F minimum. Cold running engines develop excess carbon and sludge, and can even collect water in the oil pan and develop rust in the internal spaces of the engine. Poor gas mileage is another issue with a cold-running engine. It's important that the fan belt be in good condition and tightened correctly, and that the water pump be in good condition and not leak coolant out or air in. A worn water pump can leak air into the cooling system at higher speeds, and this will cause serious problems, including corrosion, steam pockets, coolant aeration, and boilover Such a pump will usually, but not always, leak coolant out when sitting.

A pump with worn bearings will usually leak, and bearing failure can send the fan into the radiator.