Glen,
There are at least three different versions of Weber 34 ICH carburettors.
Unlike the Solex that have removeable venturis the 34ICH venturi are fixed.
There are versions with 25mm , 27mm and 29mm fixed venturi .
Over many years I have fitted the 27mm version to 400 , 401, 403 , 405 and 406 .
I have heard that Bristol engined AC, Arnolt , Cooper , Frazer Nash and others fitted with Sports Engines use the 29mm version .
A standard 85 engine could be best fitted with 25mm versions.
Pls confirm the type of engine , compression , camshaft ,etc and I have the jettings that would be a good starting point .
The car would then need to be dyno tuned to check mxtures and ignition advance through the rev range .
Geoff
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