Dual Weber 40/44/45 IDF and 40/45 DCOE carbs with 34-36 venturis on 2000cc and larger engines. 737-244 Weber Redline Jet Kit to fit dual 40/44/48 IDF and 40/45 DCOE Weber Carbs. Kit contains: Sixteen Main Jets (4 sizes - 4 of each) - .130, .140, .145, 150 Sixteen Air Corrector Jets (4 sizes - 4 of each) - .170, .180, .185, .190