Not an expert but I can search the Internet. Here is a 1938 Chevrolet truck.
Spray some lubricant on the long center hinge. And treat it gently.
It can rust up and seize. It can crack or wrinkle the surrounding metal.
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Last edited by buoymaker; 07/18/2022 7:58 PM.
"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."