[CompClassics]

There are a couple of different ways to look at the opposed and parallel descriptions, one is the way the carburetor throttle plates move, parallel = the same direction, opposed = away from each other. The other way to identify with the descriptions is the way the fuel inlets are positioned for each bank of carburetors, opposed = the inlets are opposite of each side, parallel = the inlets are all facing the same side.

Trularin brings up a very good point, the throttle linkage is the key for a Weber carburetor system. If you have even one flaw in the system your Weber system will not function properly. All to often poor Weber performance or operation is blamed on the carburetors when in fact it is a poorly executed throttle linkage. You must pay attention to geometries and distances from one bank of carburetors to the other bank of carburetors. Having mismatched components, levers, rod ends, hex shafts, etc will leave you with an untunable system. Having rod ends that have to much slop in the pivot bearing will leave you with an untunable system. In short you have payed a premium for a carburetor system to improve the performance of your engine, don't cut corners by investing in cheap linkage components or a poorly designed linkage. Aircraft specification rod ends are a must for these applications.