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The reason the B16 revs higher than the B18A/B in stock form is a combination of many factors
Stroke - 77MM vs. 89MM. The smaller stroke motor revs quicker and requires more rev's to make power. Remember horsepower is derived from torque, so you move x amount of torque up in the rev band and you make more power.
Cylinder Head - They B16's head flows much, MUCH better than the B18A/B18B head, which allows it to make power efficiently to higher RPM's. This is also why LS/VTEC turbo setups make more power than straight LS turbo setups, a more efficient cylinder head.
Camshafts - The B16's vtec cams are ground with more lift and duration to allow the motor to make power higher in the RPM band. Not much else to say about this.
Motor Design - The B16A was designed for use in lighter civics, where peak power is more important than low-end grunt to get you off the line, where the B18A/B motors were designed primarily for economy and low end power.
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