[Tom Howland]

I’m going to start up the new motor next week. I’ve taken one of the webers apart to see what’s in it. I will list the existing parts and what I think they should be changed to. I would appreciate any and all comments. I’ve gone over the Weber Jetting Survey and based my assumptions from there. Too bad there were no 427’s.

427 W
hydraulic roller
230/289 @ .050
110 separation
total lift .523/549

existing proposed
choke 37 40
emulsion tubes f7 f7
main jets 135 150
air correctors 120 120
pump jet 50 50
idle jet 70 65
idle holder 120 120
by pass ?

I understand the by pass is under the float. I took it out and there is no number on it. I can blow air through it towards the pump but can’t suck air back. Seems like a check valve. And it could be a 000. (No back flow).

On another note I noticed the one carb I have taken apart has 3 transition ports just above the throttle plate. They are at 12/3/6 o’clock and 12/2/6 o’clock. I have been following the tread Webber Transition Ports and see that mine are not symmetrical. These are new out of the box so it seems the factory is not worried about being precise. Also the float is plastic.
Thanks for the help.