unless you put on a big bore kit, the 06 engines would be the twin cam 88's. It was a good engine in my 05 road king, but not nearly as good as my '17 with a M8.

I wonder why the twin cam 96 would not work?

Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys