UFO 4-1 header install

[Jason Riggs]

What size main jets and pilot jets will I need to use when Installing a UFO 4-1 Header? Any help will be appreciated. Thanks in advance.

 

[Traumahawk]

Pilots should be the same. This is the part that THROWS people. Stock jetting (main jetting) is 152.5's. You should go LEANER, so 150's or even 147.5s. As you flow more air out (exhaust), you PULL more air in, and MORE FUEL, thats why you go leaner. Of course that is assuming floats are correct, etc.

 

[Fire-medic]

I have a UFO 4/1, and I use 147.5 mains.