A "puke" bottle can be made out of most anything. You still have to periodically check coolant levels and refill as needed. You fill the radiator with enough coolant to cover the core plus a little bit more. As the coolant heats up and expands it fills the tank. If you add too much, it comes out the overflow pipe while you are driving.
The original coolant overflow option has a tank (picture) where the coolant is pulled back into the radiator, after the engine is shut off and the radiator cools down. A gasket was added between the radiator neck and the original cap to keep the system from leaking vacuum. This is similar to what is used on today's cars and trucks except the coolant system is pressurized and the radiator cap has two valves.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
