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This Weber Carburetor Tech for VW and Porsche Engines Carburetor manual covers the complete intallation of dual Weber Carbs including the throttle linkages, and has a nice trouble shooting section to help you sort out any problems that should come up. It talks about the 40 IDA 44 IDA carbs and also the Weber DFV 228 carbs.

All the information you need to service these carburetors yourself. Why pay a mechanic when you can do it yourself?

"A nice addition to your auto tech library"