Hey Paul, What if anything are people doing with the pipe that comes off
of the engine to the interior heater core. Are we to plug that and if so
what is a good way to do it? This probably wouldn't be a good place to
run coolant to a surge tank or would it? It's location is pretty high on
the engine and then it could be circulated back to the rad. Am I
thinking the wrong way or what?

BTW, I have my engine sitting in the mounts on the aircraft. Working on
ignition, exhaust and cooling. I hope to be "making smoke" in the next
couple of months.

Thanks,
Rick in Alaska

That is essential as a breather tube to the top of the
pressure tank. That is the only way to get trapped air and steam
out of the engine in a nose high attitude.

Paul Lamar