The Stovebolt Site Forums The Shop Area Engine Shop ROCHESTER MODEL B

Has anyone tried the multiple carburation fix listed on Inliners site? I am trying,(216 top) but after knocking out the lead plug and aluminum plug I find my off idle jets to be #44 drill size or .086 a vast difference from the .070 listed. Also he says to go till you see the bit in the center vent hole. Where does he get a numbered bit over 2" in length as the hole is 2" from the edge of carb top. I also want to use the 216 venturi with the 235 base to raise the vacumn signal,anybody tried this?

I had a go at changing the part throttle jetting.Look in there with a flash light, is your drill all the way into the jet? its not supposed to be nearly that large.Was your engine having an off idle lean condition dururing crusing? Like you step lightly on the pedal and it bogs a bit? If not, don't bother messing with the part throttle mixture. Look down the carb throat, there's a spray bar running across the top just below the choke. One or two small holes are drill in the bar. Those bleed holes allow a little air to enter, which controls the vacuum signal pulling fuel from the bar.Stick a fine strand of wire into the hole,(strip a piece of #14 stranded wire) tie it off to the choke.see if that makes any difference, sometimes it does. On a 261 I used two matching carbs of the larger size.Bolted them on unaltered with 57 main jets, on a heated manifold they carbureted nicely.I did reduce the high speed jet to .028 from the stock .035.The engine pulled cleaner at full throttle after that.