Hello members. I am a recent owner of a 1957 Abarth Double Bubble. John Cuny, who has been a great help, has given me some leads as far as sorting out issues and sourcing parts. My first mechanicle issue I am trying to sort is my non functioning vacuum timing advance. My tester indicated only 2 inches of vacuum at the carburetor. When manually creating vacuum at the timing advance it started movement at 4 inches of vacuum and complete rotation at 14 inches. Clearly I don't have enough vacuum. The gentleman, Jay Niederest, who rebuilt the engine is a bit confused as he used the original cam. He also suggested I find a spare manifold from a 600, drill a test hole and check the vacuum before the carburetor. If it checks out good, then the problem would be confined to the carburetor. Has anyone had similar issues with vacuum advance? Has anyone a lead on a used manifold? Would a 600 steel manifold fit the 32 mm Weber? The spacing on the carburetor to manifold mount is 60 mm center to center. So many questions and so little time before the snow flies here in new England! Jon Hoffnagle