I know the 48 will fly a regular 80" full wing Cub with more gusto than scale flying.

You can also use a OS 52 or Magnum 52/61 carb on the 48. They will bolt right on.

Also the OS 52 head will give you about 300 rpm.

The valve parts will interchange.

Or you can recess the plug in the 48 head to make it into a 52 head