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The Dart manifold moves lots of air down these wide ports. At the time of our Small-Block Showdown, we discussed what this engine might be like with a single-plane intake. Given the chance to try it, peak torque dropped by 8 lb-ft, but stayed above 400 lb-ft from 3,100 rpm all the way to 6,100 rpm. Horsepower increased by 8, giving us a 469-lb-ft/468-horse package. And we could safely spray more nitrous.