[Learjockey1]

Michal C here is something I found when rebuilding my 2 x4 1850's on a 427 FE SO with a CC 282S cam. I understand the 1850's are meant to be stand alone carbs. There is an idle circut in the secondaies to use fuel from the secondaries so the fuel stays fresh in the bowls. When I took mine apart, I found the thin secondary metering plate (I forgot the number) had the air bleeds in the channel at the top with a diameter of .026 " and a number 35 lower sized jet hole in the bottom of the channel. Anyway, someone had put a .020" piece of wire in the channel extending from the bottom of the channel pushing up along the entire length of the channel into the .026 upper air bleed to block off/ restrict that part of the idle circut. All four of my mix screws are out about 1 turn out for best idle at about 850 rpm's.

As a note, they still rich and a little blubery , but very drivable. I have not checked or changed from the 66 mains and 6.5 PV's from the builder, I need to get an A/F meter and test with a vacuum guage, but it does not ping at cruise, 80-120 mph with 3:54's and toploader (Tremec is on the winter list), and spend time in the 3, 000 to 5,000 range on the Bahn with the pipes still dark/rich colored . This winter I will either I will go with a set of Barry R's QFT 2x4's or Webers because I know there is better and cleaner mixing.