Hi,
I have seen where people have used expansion tanks for the coyote ( I saw pics of edwardb’s car).
My question is that from what I understand the expansion tank is supposed to be above the heads and it looks tough to get it that high. Does anyone know how high in the heads coolant flows? I have seen coolant diagrams but they don’t really show where or how high in the heads the coolant is.
When I think about how the system should work I believe that the expansion tank coolant level should just have to stay above the top of the radiator in order to keep the air out of the radiator and that would prevent air from flowing backwards into the engine while it is not running. To me, the only other reason to put the expansion tank at the highest point is to fill the system. This could be done from the top port above the thermostat.
One last thing, do you need any check valves in the system? I believe I have heard both with and without. Maybe that has to do with the height of the expansion tank.

Thanks