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You won't be able to stroke any of the FB motors. They're already at their limits from the factory, heck they're past their limit (see the asymmetrical conrods). The hot ticket for more displacement is going to be a block swap from a FB25 and some oversized pistons. Crank, conrods, accessories etc. will all be interchangable, and the extra displacement ought to be good for 20-40 ftlbs everywhere depending on how well the heads flow.
S2000 folks spend craptons of money to get to 2.6 liters. We'll be at 2.5 for pocket change.
Failing that, bolt up an EJ257. The bellhousing pattern is the same, and I'll bet good money that the flywheel bolt pattern is the same as well. Get some exhaust/IC plumbing welded up and you're all set for 450 rwhp on stock internals.
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