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Periodically references are made to 101-1600 Spider Veloce cylinder heads “large port” and “small port”
…. “large” having 101 number cast into the head and “small” a 105 number cast into the head

Are there also matching large port / small port intake manifolds?
….. Is it the change from 101.21.01.060.00 to 101.21.01.060.01?
….. Is the change the diameter of the outlet hole at the rubber pad for the Weber?

Are there also matching large port / small port rubber pad (buffers) for mounting the Webers?
….. Is it the change from 101.06.01.062.00 to 105.186.01.062.00?
….. Is the change the diameter of the hole in the rubber pad for the Weber?

Has this anything to do with 40 DCOE vs 45 DCOE?
 

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I have 2 twin carb manifolds, one from a 67Duetto 105 1600 and another which appears to be from a 1300. Neither has a long part number, only a 2 on the 1600 and a 1 on the 1300. The carb sides are identical in 40mm diameter, but the head sides are different, the 1600 has larger ports, essentially a continuation of the 40mm or so, while the 13oo ports are tapered to match the intake ports of a 1300 101. I don't have a 750 1300 head to compare, but it should have the same 37mm intake valves I believe. So I suspect that my #1 manifold is for a Giulietta Veloce 1300.
 

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Jim Neill and I used to go through his vast library for the answers to these questions. If you had a dealer parts manual for 1600 Veloce dated '64, it probably has the large port 1600 101 manifold that matched the 1600 101 CASTING number head. In '65 when the head failure was recognized, and Alfa supplied the earliest replacement 1600 Veloce heads with 105 casting numbers, those came with a manifold, small port. No idea if any dealer catalog had a part number. By '66 with the 105 Duetto, both the Duetto head and manifold (small port) would have had part numbers, possibly updated from the replacement parts. By 1966, while Alfa supplied replacement 101-1600 heads with 105 casting numbers, they no longer supplied the matching manifold, and dealers were expected to use the old large port manifold with the replacement head.
I can't be sure, but as this was a non-disclosed factory replacement, applied for complaining customers that bought and serviced their car at the dealer, possibly there were NO catalog part numbers. Jim would have been able to figure this out as a challenge, but today I know of no source for this information.
 
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