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FA20 is 86mm bore, FB25 is 94mm, how would you be able to put the head from the FA20 on? That seems unlikely...a huge difference in diameter.
Maybe I'm just a complete noob, but perhaps what you're getting at is more along the lines of taking the FB25 pistons and block and putting it onto FA20 connecting rod and crankshaft. That would cut the stroke a little, but give an FB25 more room to rev. But then the head would need modification too...
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