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Holley Carburetor Jet Size Calculator . They also give instructions on changing the jets for increased performance. The video explains the various jet sizes, and how they affect engine performance. C2 Which size jets feed Primary vs Secondary CorvetteForum from www.corvetteforum.com Updated on 03/10/2021 was this article helpful? Celsius (fahrenheit) calculated main jet size. I went down three sizes of main jet and up two sizes of idle circuit air corrector (as it came from holley).