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Re: **cooling system issue**
If you’ve got a path for the unburned air/fuel to flow into when both valves are closed then that air/fuel will pressure up the coolant system.
If you keep cranking it over trying to start it you’ll get some air/fuel in the coolant passages and the majority will exit when the exhaust valve opens.
It’ll only be a small amount at each revolution but it’ll definetly flow there. Cranking compression could be 150 psi exiting into a near zero pressure.
Air is just like electricity. It will follow the path of least resistance.
Do you catch my drift on this.
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