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Just wondering why the different main and air corrector jets for this model. I am going to 30 Venturi’s on mine, with RJR 429/1195 cams, my stock jetting was 117.5 mains, with 155 air corrector jets, stock venturi’s were 28, plan on going to 127 mains with air corrector jets tbd, tough to find info on Solex, but judging from this chart there is a fair a
Mount of flexibility, anyone have any thoughts? Thanks
 

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The emulsion tubes and progression holes are different across the different carbs which affects main jet and air corrector ... as well as accelerator pump jets.

Find out which Solex you got and use as baseline ... some types look like they had 30 venturis stock already but these are likely for 1600 judging by the part # 105.26
 

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I agree, the 30’s are what are fitted to 1600’s, as stated previously, mine has the 117 main and 155:air corrector, I just wonder why they didn’t have a standard jetting across the board. Just kind of interesting.
 

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Not that this is helpful to your question, but I would love to hear your impressions of those cams once you get the jetting dialed. Is it an otherwise stock 1300?
 

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Very stock, however does have a 123 dizzy, and stinger exhaust, but that’s it.
 

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I suspect that the different jetting has to do with CO2 limits that started emerging in some European countries starting in 1970 (Germany and France). By the mid 70's Alfa started playing with jetting and cam timing with power levels on the 1800 Alfetta going from 121hp to 115hp and on the 2000 from 131hp to 127hp (all DIN) ....
 
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