In the Bolens line up, all of the Large Frames have hydraulic lift. The 2-cyl models also have 2 spool hydraulics so you can have a hydro angled blade.
For the Tube Frames, all of the hydrostatic models have hydraulic lift, and there was a "Hydro Lift Kit" available for the gear driven models. That lift kit shows up from time to time on CL and eBay, but they aren't real common.
Bolens for the most part used Wisconsin engines for their singles and the Kohler K-Series in their twins.
Edited by OldBuzzard, January 06, 2015 - 08:34 PM.