Holley Jet size

nm9stheham said

I am not sure if this is referring to the primary or secondary side, but the secondary side will have a stop screw that sets the 'at rest' secondary throttle opening. You will want to set that stop screw so that the secondary transition slots are showing about as much height as width when the secondaries are fully closed. (I.e.: Slot exposure is 'square'.)

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No. I don't want him to touch the secondary side. Especially not with the information provided. Usually the factory is OK on the secondary side and even if not, the t-slots are often high in bore and in those cases secondary idle position idle can't be judged by t-slot exposure. We can come back to this if needed once we know what the carb is, and how it runs on this particular engine.