[fordracing]

i have a 600cfm holly carb on a 302 sbf and i was wondering somone gave me a holly jet kit and it goes trough the numbers 60-100 and i want to but bigger jets in the carb but i dont know which # i sould put in it a 800cfm carb is to much but a 750 is perfect thanks jj

[Rad Ray]

Not real sure on your question, but I know most 600 Holleys come with 66 jets up front from the factory. Umm depending on your engine build and usage {street, race, cam, heads, etc} you should be fine where your at going by your cubes. But If you have to touch It 2 steps up or down Is as much as I would go.