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Ndutton>> the manifold outlet is connected directly to the exhaust mixer. The water circulation goes as follows on my engine:
-raw water intake>water filter>water pump> T fitting (1 way inside engine through side plate, other is bypass hose) > bypass hose > thermostat housing > hose connected to my water heater/heat exchanger> hose coming back to the manifold inlet> manifold outlet connected to exhaust.
I checked each step separately and the whole thing together. I can blow water in any step of the way and it comes out clean with good flow anywhere I check, including when I check after the manifold. I also did the test bypassing the water heater/heat exchanger, but I am going to do it again right now with the engine on this time instead of just forcing water in.
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