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The best answer is "it doesn't work that way." Two engines of the same displacement can have very different power ratings. As a rule of thumb, assume that a "modern" engine (anything designed in the last 10-15 years) has far more power than anything from the 1960s or 1970s of the same displacement. An GM "Big Block" engine, such as the Rocket 455 (7.5 L), from the early 1970s only produced 300-400 HP or so; modern engines can easily achieve that at much smaller sizes.

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Q: What would a 420cc engine equal in horsepower?
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