How about starting with photos
Original undamaged overflow or condensation are I believe relatively scarce. From what I have seen looks like they were made by a coffee can manufacture.
I have fabricated cans of approximate size and shape for my trucks.
Function of the cans is very definitly more overflow recovery of expansion if the system is sealed well as the engine cools it draws the fluid in tank back into the radiator and engine. Problem generally being getting the radiator cap to be a true seal.
How about photos and dimensions of know orginal cans.
Was there a difference from Pattern 12 to Pattern 13 Chev? The parts manual lists it as:
Radiator Overflow Tank
Tank Assy. Radiator Overflow (First Jobs) (on top of Fender) 5805402
Tank Assy. Radiator Overflow (After Jobs) (under Fender on Footwell Panel) 5819685
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