Do they have jets in the secondaries on a RB modified 600?

yes, but i do not know what size or mods they have done.. but i can tell you from experience that the mods do make the car run faster and stronger.. We have bought these from RB for years.. https://www.nopistons.com/forums/pub...IR#>/smile.png

Last time I checked (long ago), they used a metering plate on the secondary side. There are no fuel jets in the plate - they are fixed orifices. You can replace it with a metering block, but I do not know if RB modified the plate to begin with (any such mods would be lost in switching to a secondary metering block).