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With the boosters in place, the body is then machined to eliminate any rough edges from the sides. Once completed, the top and bottom areas were also checked to ensure a perfectly flat surface; Often times, cutting 0.007-inch seems to be the norm, but this will also promote a better seal for the gaskets. Note: this process is vital on older carbs, especially since you never know how much the bolt holes have been pulled in from constantly removing the bowls. This ensures no leaks, which is detrimental to a blow-through setup.