Biggest difference between 4.107 and 4.108 (other than 1 cubic inch displacement) was the change from wet to dry sleeves. Ergo, dry sleeves = 4.108.....
Most external parts
are interchangeable between models. Internal parts
not so much. Good news is 4.108 castings (eg: pistons, cranks, rods, etc) are still available, while production of 4.107 castings ceased in the mid 90s.
As far as I am concerned, the discovery of having a 4.108 instead of a 4.107 is good news. Easy and reasonably inexpensive to rebuild
, and no worries about the wet sleeve O ring lands warping and allowing coolant
into the crankcase.