Good info-- this will get me started on kicking around ideas on these kit mods.

I may have a wrong mental image of how header tanks function. I was thinking that the since main tank is pressurized and the fuel was being "pushed" to the header tanks, the draw to the main tank was not a factor. Putting check valves in each muffler pressure line would keep the system from losing pressure when one engine quit. But header tanks and check valves is getting too complex, so I'll apply the KISS principle here.

I was a bit conservative on the engine size-- it would fly on a pair of 46's, but there wouldn't be much margin for cargo or engine failure. I'll add some displacement...

Thanks--

--Bill