Apologies if this has already been discussed, but as I work to bring my '71 Series 2 back to original, I remain puzzled by the coolant line running through the intake manifold. I've now reconnected it, but only for appearance purposes.
When a car is first started, the coolant is, as name suggests, cool. So how can it have any effect on smoother running when still cold? But on the other side of the equation, once the engine warms up why would we want to be heating the intake manifold? Having the coolest intake charge is fundamental to performance is it not? The cool fuel mixture is more compact and will there expand to a greater measure at the point of ignition.
Any thoughts and/or wisdom would be appreciated.