Im pretty sure the 26 crank does not fit the 25 block.... fits a 20, they share the same size rod journals but the main journals are different 20/26 to 25. You can put a 25 head on a 26, 26 head on a 25. 26 rods aka 25 neo rods in a 25.
I think what you need is better management and a fresh bottom end. if your on a budget 26 rods in a 25 with forged pistons and call it a day.
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