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Old 04-15-2019, 03:29 PM   #1
BlouDon
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350: Coolant flow when t/stat closed?

My '70 C10 is not fitted with a cabin heater (yet). Beside hoses from water pump and t/stat cover to radiator, there are no other coolant hoses. 350 SBC (Gen 1 -I think...).

Am I right by saying that there will be zero coolant flow while the t/stat is closed?

If I am wrong, please explain to me what route is available to coolant while the t/stat is closed.
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Chev: '70 C10 350 V8 / 700R4
Jensen Interceptor '73: Mopar 440 / TH400
Jensen Interceptor '74: Mopar 440 / 4L60e
Jaguar: '72 E-type Coupe V12 & '80 XJS
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Old 04-15-2019, 05:11 PM   #2
garyd1961
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Re: 350: Coolant flow when t/stat closed?

You should have a bypass built into the water pump if everything is original. If it has aftermarket or vortec heads it probably doesn't have a bypass. Either way it's good idea to add a bypass hose.
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Old 04-15-2019, 11:03 PM   #3
Steeveedee
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Re: 350: Coolant flow when t/stat closed?

The water pump has a bypass built into it on those era vehicles. You could buy a truck with no heater and they worked fine without a bypass hose. I don't know about LS or Vortech, you'd have to check that out. Can you show us a picture of the engine?
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