Originally Posted by
John_M_
If I were to run the os boxer on gasoline, I'd make a modification to the intake runners... I would cut the runners off about 5/16" - 3/8" behind the tube nut... leaving a stub and then use a rubber coupler to re-join the intake runners back onto the end of the stub... leaving a small gap between the ends of the of the cut tube... to thermally isolate the intake runners completely from the cylinder head.
The runners remain near completely cold,, despite the metallic contact where they connect to the head.
Also very little heat soaking after a hot engine stop. No explanation why, just an observation.