holley 4180
Junior User
Joined: Mar 2004
Posts: 63
Likes: 0
Originally Posted by ford390gashog
is that enough
applications. Unless you are into serious racing, don't go any larger on
carb size. (Been there-done that......)
Lead Driver
Joined: Dec 2003
Posts: 6,773
Likes: 7
From: On the road in Ohio
i just bought a holley 1850-2 {600cm?}for my 64 t-bird with a 390. i had to rebuilt it, it works great but i'm not sure i have it adjusted correctly, there is a small screw on each side of the front fuel bowl , how do you go about setting it, and also how do you adjust the setscrew ontop of the fuel bowl? thanks for any info....
Senior User
Joined: Sep 2002
Posts: 431
Likes: 0
From: Midwest
The screws on the side should be idle circuit. With vehicle off turn them all the way in and then back out one full turn. Put a vacuum guage on the carb and then start vehicle, adjust each screw out approx. one quarter turn in even increments until you hit highest vacuum reading and then turn them in approx. quarter turn. Set screw on top is float level adjustment, take plug/screw off the side of bowl. Start vehicle, loosen screw on top of the float bowl and then adjust nut until you have fuel just weeping out of the hole on the side of the float bowl. these are just general holley tuning tips, if anybody knows of a more specific adjustment setup for the 4180 feel free to jump in.
T. Roberts
UFD Local 1147
T. Roberts
UFD Local 1147
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Lead Driver
Joined: Dec 2003
Posts: 6,773
Likes: 7
From: On the road in Ohio
thanks for the info, i got it set now. just for anybody's info when i adjusted the carb, i discovered that there are tiny round cork caskets that the idle screws use to seal themselves , and that they will leak vacum, just enough to make the truck/cars run rough, once i replaced them , i was able to get the car to run smoothly at idle.
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