Reply to "weber carbs"

Quad 2bbl Webers have always been touchy to tune correctly, and are expensive to work on. There are 4 fuel jets & two air jets per barrel (8 barrels) and the cheapest Weber jet is around $4 ea. Since all the circuits are interconnected to a degree, its easy to get lost trying to tune. Finally, Webers went out of production in the '80s so real experts are hard to find & NOS parts are scarce. Typically, owners search until they find someone who knows something about the carbs, have the set adjusted and then never touch them again, which is not how Webers should be used. They change calibration with the weather, the type of gasoline used and the drivers mood.... A dyno run is valuable once a basic setup is found. PLugged upper air-bleeds are fairly common; I found a weed-seed stuck in one of mine once. FWIW, I'd suggest going to weber-lookalike EFI rather than carbs; cost is similar as is power output, mileage is better and tuning, once you understand whats going on, can be done with your laptop computer.