I think that the hoses coming back from the block heater spigots (my assumption) to the bottom of the intake manifold are interesting.
IMHO, they might be useful for the first 5 minutes of warm-up, and then be a power-robber (by heating the intake charge) the rest of the time.
I am assuming they are water hoses, because of the hose coupler on the tube, like a radiator flush port.
Rocky
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