[art leong]

Originally Posted by A56

I put them anywhere between 10" - 14" out on the primary tubes, try to find a good average for all eight and stick with that # of inches away from port. If you have a step in that area, put them right after the step, this helps because you just added some area to the primary tube, and if you do it just after a step the area change isnt as critical. Make sure you use a long O2 weldment, so the O2 dosent protrude into the tube excessively. In the collector I put them in the choke if the choke isnt excessively small, or just before the choke as to not change the area but get all the gasses. Though lots of people say not to put them in the collector, I dont agree, if your collector isnt short, they work fine there. I have not tried them on a straight collector, but can only assume you will get outside air at low RPM.

Mark Lelchook
F/SA

Mine shows excessively lean at low rpms. I once tried to tune the idle before I knew about the extension trick. And it was smoking black and still showing lean.