Preheat the oven to 315°F and prepare a 10-cup Bundt pan with your preferred nonstick method.
In a stand mixer, beat the butter on high for 2 minutes, then add sugar and salt. Cream for another 7 minutes until pale and fluffy.
Add eggs one at a time, mixing well and scraping the bowl as needed.
On low speed, gradually add flour in two batches, mixing gently to avoid overbeating.
Pour in 7-Up and lemon extract, scrape the bowl, and mix until just combined.
Pour the batter into the prepared pan and bake for 75-85 minutes, or until a toothpick comes out clean.
Cool the cake in the pan for 10 minutes, then invert onto a plate and let it cool to room temperature.