Yeah, know you have been wrestling with that one. Have taken a piece of tin foil folded into an "A" and put that into the Ultrasonic Cleaner as a test. If the cleaner is working correctly the tin foil will come out like it has been through a shotgun blast, full of small holes.
The Edelbrock Carbs have a nice smooth additional factory finish that easily clean up nice with the Ultrasonics.
The factory carter carbs are raw aluminum and are more porous and are harder to get clean, requiring some additional manual cleaning during the Ultrasonic steps.
