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It's the rods more than the pistons but I've heard of cars on standard internals doing 230 bhp maybe more . But then after a continual beating bending rods as a result lol
Yeah ARP's of course, personally I wouldnt risk stock rods for proper power, you only have to have one snap and your whole engine is ruined.
But 250bhp being sensible with the RPM shouldt be too bad.