Solex 911 1964-65 Carbs question

[Ubbe]

Hi

Managed to get my hands on 2 NOS solex carburettors for 1964-65 911

Booth are having stickers with Porsche part nr s they have the aluminium strip with same part nr.
Booth are never used, no screw marks, they are not in any way modified, they still has the color markings they have untouched pressings on the shafts.

Interesting fact here is that inner diameter is 40 mm on one, 45 on second. Venturis are different aswell

Standard is 40 mm

Anyone else seen a 45 mm solex PI ???

Pictures here

[1QuickS]

From my web site:

According to Karl Ludvigsen, Ferdinand Piech requested Weber to create a triple throat carburetor design to replace the Solex 40PI carburetors developed for the early production 911 and to use that design as a basis for a racing version capable of receiving larger venturis than the Solex design could accommodate. The first application for this triple throat Weber design was in support of the 6-cylinder Porsche 901/20 racing engine. Six 904 GTS race prototypes (906 and not 904/6) were outfitted with this engine in 1963. Carburetor testing using two of these 906s was conducted at Monza in December 1964; one used Weber 46IDA3C carburetors with 46mm throttle bores and the other used Solex 40PI carburetors with their throttle bores increased to 44mm with the 46mmWebers being selected for competition use.