Coolant Overflow Tank

You guys are so low tech! Here's mine that I used 35 years ago. Easy to see after I pulled the front end off my 69 Charger.

Some random plastic bottle from the trash with tape holding the hose in. Sitting next to my Cool Can (remember those?) and my DC chrome ignition box. Ran it that way on the street and track for better than 10 years!
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Oh, and my junkyard A/C condenser that served as a tranny cooler too!