[Rick Parker]

Hotfingers is right on! There should be enough of the slot exposed to create a "small square" visable with the carb upside down. This way there is a small amount of emulsification taking place in the metering block already and fuel is already being mixed, although in a very small volume. This set things in motion so when the secondaries are opened they can come online immediately with a minimum of hesitation, the balance of the manifold depression being overcome by adjusting the accelerator pumps, the squirters sizing and their timed delivery. It's all a compromise at best.

Rick