416 jetting

[Carl Nevins]

i have a 416 w/full hmf, port/polished head stage 2 hotcam aluminum airbox no lid need some jetting suggestions, currently running 160/42 stock clip pos.& air screw is still at stock setting, the plug looks like it is pretty lean. thanks for all the help. live at 500ft asl

[Evan400ex]

I have a 416 with motorwork similar to what has been done to yours. I am currently running a 165/38 setup and runs very good. I had a 170 main but that was way to fat,....then I tried a 160 and that was to lean. Try the 165 main and see what that does.