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identify this on intake manifold 1937 D7 4 Door

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I assume you are talking about the spring that operates the heat riser in the exhaust manifold. It helps get the engine warmed up faster and then the bi-metal spring heats up and opens the heat riser.  It heat riser is stuck i the closed position, your engine will probably run hot.

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It's actually closed when the weight is up. The heat relieves the tension in the spring allowing the counterweight to fall and open the shutter. This helps to warm the fuel in cold weather for better atomization of the fuel.These things usually corrode tight but can be carefully loosened up.It's usually an easy fix and can really help when starting.

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