The 19th c. pitcher were pitching 500 innings a year. If you're doing that, you can be half as "good" of a pitcher as today's aces, and contribute the same number of wins to your team. So I'll nominate Pud Galvin's 1884: 636 innings with a 1.99 ERA (or 159 ERA+ if you like normalized stats).
For live-ball, how about Dwight Gooden's in 1985. 276 innings at a 229 ERA+.
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