I don't know why people on forums are so interested in engine only. May be its just a point of discussion for you guys. The current engine is doing great, PAF is happy with it. Plus, some tweaking with their basic design has increased their performance and reliability. The current needs of JF-17 is full filled by the current engine. It generates enough power to perform well even with greater weapon load. New engine discussion would be required when Block-III will commence, till then necessary tweaking and refinement in current engine is enough for PAF.
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As far as I know people on this forum are interested in many more things besides engines, like AESA Radar, Improved Avionics package, In-air refueling probe, twin rails for missiles, Raad integration, etc etc but most of these things depend on a more powerful engine in one way or the other, hence more discussion about engine. Second, without engine there would be NO Thunder, all other things can be compromised.
Current engine is doing "GOOD", PAF is happy becaus ethey DO NOT have any choice, if they can get GE or P&W engines they will not take 24 hours to mae a decision (ignoring sanction threat).
Why do people keep saying that by "Tweaking" we have improved the performance, as though we know more about that engine then the manufacturer. Jet engines are very complex machines they can not be tweaked like that to get better performance. It's not like replacing original jet valves in 80' Corolla withh bigger ones to get more power. When we use the term "Performance", it's notjust power its a combination of multiople factore which include power, fuel economy, wear and tear, engine life, etc. etc.
Officially there is no block II or III. This term is coined by PDF fans only, correct term should be batch. Ther eis a huge difference in term "Block" and "Batch". Now that there is no concept of III block (atleast as of now) then relating the engine to it is meaningless.
Because there are no significant differences in airframe design of three batches of 50 Thunders each, new improved engine RD-93MA (if available and viable) can be replaced in any number of jets regardless of which batch they belong to.