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That's an interesting project. Regarding engine pre-heating, even if your cars stay inside at night during winter, some electric coolant heater and a heating pad at the oil sump can actually be very helpful regarding efficiency since it would lead the engine to its optimum temperature sooner. You might even take a look at wrapping the sump externally with some insulation. BTW do you remember some big rig engines such as the Detroit Diesel Series 60 had composite sumps and some Caterpillar engines even have composite valve covers?
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