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Two ways to make big power naturally aspirated - revs and displacement.
Sure you can throw a larger cam in the motor and increase efficiency between porting and polishing......you can lighten and balance the reciprocatng assembly to free up some power (although generally, light ened parts give up some strength....nature of the beast), but eventually there's only so far you can go.
Where's the maximum? I don't know....but I bet you can get 300whp out of a 3400 if you really try.....all bets are off on how long it will survive though.
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