Interesting Weber jetting

[jimf]

Eljaro, looking forward to the results of your new modifications.
After reading all the info here in this thread, I decided to increase the chokes from 37 to 40 before I even install the conversion on my 393 w stroker. When I recieved my new 40's they looked as rough as the 37's did, so I decided to machine them internally. Made up a profile tool bit the same as the contour of the 40 and machined away. Well the 40's had to be machine to 41.5 mm before they would all clean up round and true. These castings are very poorly made and not consistant. Some of them would have cleaned up to about 40.75 mm and the others had to go as far as 41.5 to clean up. This will give you an idea of how much different one of your carb bores could be different from the other, right from factory. So now my delema is ....do I use the 41.5's or do I machine out the set of 37 mm chokes to 40 mm like I was going to try? Would you think the 41.5's might be too big?.....Anyone have comments?