Well, Fred, I’m certainly not a carburetion expert by any means, but I have been putting in quite a bit of time on the old Rochester “B” this summer. I have B’s from 1950(I think this was the first year) up to newer ones from the 60’s. As far as the needles & seats go every one of the ones that I have opened up have had a .090” nominal sized orifice. It would be my guess that every one of these have probably been rebuilt somewhere along the line, so what the original seats were drilled to is up for grabs.
Now as far as the floats go I feel pretty strongly that they all had the same size float size. Every one that I have disassembled and the new one I just bought from NAPA are the same. The only differences have been that some have a plated steel connecting/pivot arm and some are brass, of course all of the floats themselves are brass. Here’s a picture of a few from different carbs, off 216’s and 235’s;
http://rides.webshots.com/photo/2245361820098611668tlMRdr Isn't that BC a dandy, I just opened it up for the first time to match up the float to older ones. I have no idea what the white deposits are inside, I can't believe a couple ounces of fuel would leave that much residue. I picked it up at an antique shop for a few bucks.
Denny Graham
Sandwich, IL
