you don't want a rotating kit, you mean a stoker kit?
If so, Brian Crower makes a stroker kit for the F20c
BRIAN CROWER 2.47L STROKER KIT: F20C/F22C (97mm STROKE BILLET CRANK/PRO-SERIES RODS/PISTONS) - BC0069 - DIRECT TUNING
And the engine is already a 2.0 or 2.2l depending weather you have an AP1 or AP2 s2000. This kit would make the motor roughly 2.4l. I'm not an expert on F20's but I would wager certain other F and K series parts MAY be interchangeable, but internals are fairly specific to the motor they came from. Deck heights, bore sizes, ect can all be different between engine models of the same family.
If so, Brian Crower makes a stroker kit for the F20c
BRIAN CROWER 2.47L STROKER KIT: F20C/F22C (97mm STROKE BILLET CRANK/PRO-SERIES RODS/PISTONS) - BC0069 - DIRECT TUNING
And the engine is already a 2.0 or 2.2l depending weather you have an AP1 or AP2 s2000. This kit would make the motor roughly 2.4l. I'm not an expert on F20's but I would wager certain other F and K series parts MAY be interchangeable, but internals are fairly specific to the motor they came from. Deck heights, bore sizes, ect can all be different between engine models of the same family.