Volvo Penta used to offer a basic overhaul kit and a complete kit, but the complete kit have been discontinued and
the basic kit will be discontinued soon..
However you can still get the parts that were in the kits.
The basic overhaul kit includes 6 cylinder liner kits (liner, piston, rings, seals etc), all the bearings and all the gaskets and
seals for the engine.
The complete kit used to include a turbo, water pumps (both circ. and R/W), injectors and a head rebuild kit. Again you
can get these parts, but no longer as part of a kit.
What we tend to do when rebuilding is to get the Basic kit and the head rebuild kit and pick and choose whatever else