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Reply to "Coolant tubes under the car"

the larger return would lower the pipe's friction/resistance and thus allow the returning coolant to be at a slightly HIGHER pressure.

higher pressure at pump suction reduces the possibility of impeller induced cavitation.

if the system's pressure setting of the radiator cap was on the suction, it would make little differance

the curtain area at full open (1/4") is the area of the original coolant tubes
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