That is a very good video for someone that insists on running one of those for what ever reason. It would have been better for all those that do not have a full set of tiny drill bits to mention what size the orifice started out at and what size it ended up at. .009" bigger is not the best way he could have communicated his changes.

With all the information and parts out there for the Holley platform carbs, I have always been surprised at the lack of CarterBrock parts and this kind of deeper tuning info given how many are out there.

But one look at the tuning charts for the metering rods and jets should still cause most guys to look for a carb elsewhere. I'll say again, the CarterBrocks are not necessarily bad carbs, it's just that there are much better choices out there today. Heck, in the Engine Masters recent cheap carb shoot-out, the CarterBrock came in last place. Even the Summit carb beat it.