Tuning Weber Carbs

My first recommendation is to find a Weber specialist and pay him for his time. There are 5 jets and two air bleeds per barrel, you have eight barrels, and all the jets interlock to some extent. The cheapest Weber jet is about $4.50; one tends to accumulate quantities of these things when tuning. I spent years getting my Webers to run properly, and still they changed significantly several times a year, for no known reason. They are very sensitive to debris so use the best big filter you can find, they do not tolerate additives well either since most change the density of gasoline enough to affect jetting. Good linkage can also be a problem, and I'm sure you know they have been out of production in Italy for a decade, so parts aren't easy to find. It can be done, but....

Second suggestion: if you are unable to find a local Weber expert or are immune to pain and thus are a do-it-yerselfer, try e-mailing Byron Hight of Nor-Cal Panteras. Byron currently has Webers & 180 degree exhausts and IS such an expert (the Webers were mine and he had to do significant tuning to get them to run on his car) (byron_c_hight@amat.com).

Thanks for your comments. FYI, 48 IDAs are actually back in (limited) production. If you check the usual sources, I believe you'll find that you can buy all of them you want depending upon the depth of your pockets. I've seen prices for units from the recent production expressions ranging from $495-$695 depending upon who is offering. Pretty steep, but seems like people are asking $2-3k for well used sets of 4 on an intake.