Bear in mind that the block will be on the LOW pressure side of the loop.
It's the condenser that needs to be able to withstand high pressure.
The evaporator needs to be able to withstand very low pressures, but the pins should stop the top from collapsing.
8-ball
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For those who believe that water needs to travel slowly through the radiator for optimum performance, read the following thread.
READ ALL OF THIS!!!!
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