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The Performer LT1 intake ports are a modest 170cc, but they are perfectly sized for a 350 cubic-inch small-block headed for the street. According to Edelbrock project engineer, Ulises Gonzalez, "The LT1 Performer is pretty much matched to the intake gasket right out of the box. We did this to make it a direct bolt-on. Guys don't really have to grind on it."