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

       Rick
       Are you meaning the approx 5/8 inch line out of the left rear of the
       engine that would go to the heater core.
       I'm wondering if Paul is thinking you mean the small outlet on the
       top back of the engine!
       This originally went to the throttle body from memory and is
       important I understand in getting trapped gasses out of the block.

       I've just blocked the heater outlet with a rubber plug at present
       for initial starts but was wondering the same thing.
       I think others have pulled the tube from the block and
       tapped and plugged the hole.

       Steve Izett
       Perth West Oz Renesis Glasair SII RG

       I'll see you in a couple of weeks Steve. I'll bring my camera :)

       Paul Lamar



   Steve, Yep that's the one (the 5/8"). I guess tapping and plugging
   would be
   ok. Any other ideas out there?

   Thanks,
   Rick in Alaska

Rick,

Be careful tapping that hole.  The material is very thin.  I've seen a
freeze plug used, but safety wired.

Mark S.