1.I am using 1.75" steel exhaust tubing for my coolant lines. I have painted them with "ceramic" brake caliper paint, and I want to insulate the lines under the car and where they enter the trunk compartment. What are you guys using?
2. Is an expansion tank necessary? My build has bleed valves located on the thermostat housing, and the top of the return line in the trunk compartment. I have a I will be using 50/50 antifreeze/water mix, and when all is sorted I will change over to Evans waterless coolant. The anti-freeze and eventual change over to waterless coolant will be done with a vacuum type tool, so it *should* completely fill the system.