Thread: I need some ideas on 350 S/B "Over Heating"

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first place i'd start is to check your thermostat. Sometimes, especially if you used a stop leak additive such as Bar's leak, the thermostant becomes plugged and the motor has to get really really hot for it to actually open. Then i'd check for radiator flow just in case. I know yours is new but you never know... You might also look at that water pump. sometimes the old saying "you get what you pay for" is learned the hard way. If you bought a generic, cheaplike water pump, you might be getting generic, sucky results.

To the question about air lock, as the water flows through the engine, the air would eventually work it's way to the top of the radiator.